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Evaluation of factors affecting the quality of compost made by smallholder farmers in Malawi

By Patson Cleopus Nalivata

Abstract

In Malawian agriculture, the use of compost as a soil amendment has received much attention over the last few decades. Despite this, little is known about the commonly practiced composting systems in Malawi and their potential in mitigating soil fertility problems experienced by smallholder farmers. This study characterized the Changu (turned and watered regularly) and Chimato (covered with mud and static) systems and investigated optimum conditions required for effective composting. It further investigated nutrient release characteristics of the composts from these systems and their impact on maize crop establishment. Replicated compost heaps were formed from wheat (Triticum aestivum) straw and grass /clover (Lolium perenne/Trifolium repens) (in the UK) and maize (Zea mays L.) straw and green bean (Phaseolus vulgaris L.) residue (in Malawi) using the Changu and Chimato systems. Four initial C:N ratios of 20:1, 25:1, 30:1 and 60:1 were studied in the UK whereas two initial C:N ratios of 20:1 and 30:1, chopped into two lengths (5 or 10 cm) were used in Malawi. All the treatments were set in a randomized complete block design and the composting experiments ran for 112 days in the UK study and for 77 days in Malawi. Incubation-mineralization studies using the resultant composts were run for 42 days and 84 days for UK and Malawi respectively, followed by a maize establishment study run for 25 days. The Changu systems had significantly longer mesophilic phases (19 days) and active composting periods (24 days) compared to the Chimato systems (14 and 22 days respectively). The temperature profiles for the two systems were similar in the glasshouse, but differed in the field due to reduced insulation in the Changu (uncovered) system. The composting processes in these systems contributed to the production of compost with as high as 1.1% total N. A higher concentration of NO3-N (406 mg/kg dwt.) was produced in the Changu system cf. Chimato (359 mg/kg dwt.) whereas a higher concentration of NH4-N (36 mg/kg dwt.) was produced in the Chimato system cf. Changu (34 mg/kg dwt.) for the Malawi compost. Similarly, Changu system resulted in greater concentrations of TON (61 mg/kg dwt.) cf. Chimato (24 mg/kg dwt.) whilst Chimato contained high concentration of NH4-N (61 mg/kg dwt.) cf. Changu (8 mg/kg dwt.) for the UK compost. No differences were observed in the concentration of extractable-P and extractable-K in the two systems for the UK studies whereas Changu treatments and those from initial C:N had more P in Malawi. Resultant compost pH ranged between 6.8 and 8.6 for the UK-based studies and between 7.2 and 8.9 for the Malawian-based study. Incubation-mineralization studies indicated temporal differences when the resultant compost from the two systems (Changu and Chimato) was incubated in the soil with respect to nutrient release. Initial feedstock C:N ratio had a significant effect, treatments with C:N 20:1 mineralized nitrogen whilst those with initial C:N 30:1 and 60:1 immobilized nitrogen compared to the control for the UK experiments. No immobilization was observed for Malawi resultant compost. This was reflected in the maize establishment trials when compost from the two systems was used as a soil amendment. Treatment with materials from initial C:N 20:1 produced significantly larger plant stalks and high plant biomass (0.92 g/plant (dry basis)) than the other treatments. Varied differences were observed between UK and Malawi with respect to composting system on plant growth. The use of compost from this study increased CEC of the soil by 2.1 cmol/kg. Efficient composting requires low C:N material and the required compost time and resultant quality is dependent upon the C:N ratio of the initial feedstock. The longer active composting time in the Changu systems appeared to influence production of TON compared to the Chimato. It is suggested that to optimise the compost quality there is a need to encourage the smallholder farmers to grow green leguminous crops which they can mix with the straw to reduce the initial C:N ratio to improve its compostability. It is also important to increase the number of aeration holes in the mud coat of the Chimato heap in order to improve the oxygenation process of the material and to use them for moisture adjustments. A cost benefit analysis conducted suggested that the lower the initial C:N ratio and the longer the chop length (≤ 10 cm), composting using the Changu system, the higher the net benefits which can be attained

Publisher: School of Applied Sciences
Year: 2007
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/1720
Provided by: Cranfield CERES

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Citations

  1. (2002). A call for composting in Malawi. Malawi Nation News, doi
  2. (1997). A comparison of vermicomposting and composting.
  3. (1993). A quantitative respirometric method for monitoring compost stability. doi
  4. (1994). Acacia albida on soil and maize grain yields under smallholder farm conditions in Malawi. doi
  5. (2006). Achieving an African green revolution: A vision for sustainable agricultural growth in Africa. African Fertilizer Summit,
  6. (1995). Activities of rhizosphere microorganisms as affected by application of organic amendments in a calcareous loamy soil. 2. Nitrogen transformation. doi
  7. (2004). Amelioration of composting process by fertilizers. doi
  8. (1993). An agro ecological framework for integrated nutrient management with special reference to Kenya. Doctoral Thesis,
  9. (1994). An agronomic analysis of the results from the MOA/UNDP/FAO fertilizer demonstration programme 1989-1993,
  10. (1990). An introduction to soil humic substances, pp 1-12. In: MacCarthy et al. (eds). Humic substances in soil and crop sciences: Selected Readings. doi
  11. (2001). Approaching “Functional” soil organic matter pools through particle-size fractionation: Examples for tropical soils.
  12. (1996). Assessing soil nitrogen, phosphorus and potassium for crop nutrition and environmental doi
  13. (1999). Assessment methods for soil carbon.
  14. (2004). Available at http://www.faostat.fao.org/ last accessed
  15. (1986). Basis for the control of soilborne plant pathogens with composts. doi
  16. (1984). Biological management of tropical soil fertility for sustainable productivity.
  17. (1977). Biological reclamation of solid wastes. doi
  18. (1993). Calculating soil nutrient balances in Africa at different scales. I. Supranational scale. doi
  19. (1996). Canopy light reflectance and field greenness to assess nitrogen fertilization and yield of maize. doi
  20. (2001). Characterization of soil organic carbon pools,
  21. (1999). Combined Inputs of Crop Residues and Fertilizer for Smallholder Maize Production in Southern Malawi. doi
  22. (1997). Combined use of organic and inorganic nutrient sources for soil fertility maintenance and replenishment In: Replenishing Soil Fertility In doi
  23. (2000). Comparison of best-bet soil fertility technologies. Maize Production Task Force,
  24. (2003). Compost mineralization in soil as a function of composting process conditions. doi
  25. (1996). Composting and evaluation of racetrack manure, grass clippings and sewage sludge. doi
  26. (1992). Composting and land application of animal wastes. doi
  27. (1996). Composting of municipal solid waste and its components. doi
  28. (2003). Composting of source-separated household organics at different oxygen levels: gaining an understanding of the emission dynamics. doi
  29. (1981). Composting process control based on interaction between microbial heat output and temperature.
  30. (1993). Composting quality and standard specification: European perspective.
  31. (1962). Continuous thermophilic composting.
  32. (2003). Contribution of promiscuous and specific soybean variety residues to soil fertility improvement and maize yield under smallholder farms in Zomba District,
  33. (2001). Critical aspects of organic matter management in the Tropics: the example of India. doi
  34. (1980). Crop residue influences on soil carbon and nitrogen in wheat-fallow system. doi
  35. (2005). Delayed nutrient application affects mineralization rate during composting of plant residues. doi
  36. (1993). Determination of compost biomaturation. 1. Literature review. doi
  37. (1993). Determination of compost biomaturation. II. Optical density of water extracts of composts as a reflection of their maturity. doi
  38. (1993). Diversity of composting systems, doi
  39. (1988). Earthworm activities and the soil system. doi
  40. (1980). Effect of burning cereal straw on soil properties and grain yields in Saskatchewan. doi
  41. (1998). Effect of NH4 +-fertilization and organic matter amendments on soil respiration in three different soil types - Thesis submitted in partial fulfilment of the requirements for the degree of Master in Soil Science and Eremology.
  42. (1988). Effect of nitrogen supply on the comparative productivity of maize and sorghum in a semi arid tropical environment: 1. Leaf expansion and leaf nitrogen. doi
  43. (1981). Effect of organic matter on exchangeable aluminium and plant growth in acid soils. doi
  44. (1995). Effect of various phosphorus availabilities on radiation use efficiency in sunflower biomass until anthesis. doi
  45. (1979). Effects of bulk density and soil moisture on radicle elongation of some tropical crops. In: Soil physical properties and crop production in the tropics,
  46. (1995). Effects of incorporating straw, using different cultivation systems, and of burning it, on disease of winter barley. doi
  47. (1986). Effects of organic acids on aluminium toxicities in subsoils.
  48. (1996). Effects of organic legumes and inorganic fertilizers on maize yield in Malawi. Target Patson C. Nalivata PhD Thesis Cranfield University 7-7 Newsletter No. 7, Soil Fertility Network for maize-based farming systems,
  49. (1997). Effects of stockpiled and composted manures on germination and initial growth of cress (Lepidium sativum). doi
  50. (1997). Effects of two composts and seven commercial cultivation media on germination and yield. doi
  51. (1981). Evaluating toxicity of immature compost.
  52. (1989). Evaluation of city refuse compost maturity: A review. doi
  53. (1999). Evaluation of seed germination and growth tests for assessing compost maturity. doi
  54. (2005). Excessive pile sizes. Science and Engineering. Cornell waste management institute.
  55. (2000). Extent and causes of land degradation. Available at hhtp://www.fao.org/ag/agL/agll/madssea/topic2.htm last accessed
  56. (2004). Factors affecting the rate of windrow composting in the field studies. doi
  57. (1999). Field guide to on-farm composting.
  58. (1989). Genotypic variation in maize shoot biomass at different stages of development. doi
  59. (2003). Gross nitrogen mineralisation-, immobilization-, and nitrification rates as a function of soil C:N ratio and microbial activity. doi
  60. (1985). How straw incorporation affects the nitrogen cycle.
  61. (1990). Interrelations between microclimatic variables and the soil microbial biomass. doi
  62. (1994). Kupanga manyowa a kompositi. Ministry of Agriculture,
  63. (1998). Leaf area expansion and assimilate production in wheat (Triticum aestivum L.) growing under low phosphorus conditions.
  64. (1998). Legume biomass production and maize yield response in legume manure rotations in Malawi. In: Annual Research Project Report for the 1997/98 season for the Cereals Commodity Group,
  65. (1994). Long term tillage effects on grain yield and soil properties in soybean/grain sorghum rotation. doi
  66. (1995). Long-term spring wheat response to summer fallow frequency and organic amendment in southern Alberta. doi
  67. (1989). Malawi maize improvement and production research action plan. Chitedze research station,
  68. (1996). Malawi renewable natural resources profile.
  69. (1998). Malawi: Soil fertility issues and options. Rockefeller Foundation –
  70. (2002). Material and energy balances in a large-scale aerobic bioconversion cell. doi
  71. (2001). Mature green waste compost enhances growth and nitrogen uptake in wheat (Triticum aestivum L.) and oilseed rape (Brassica napus L.) through the action of water-extractable factors. doi
  72. (1984). Mehlich 3 soil test extractant: A modification of doi
  73. (2002). Methods in agricultural chemical analysis: Practical handbook. doi
  74. (1996). Methods in soil biology. doi
  75. (1995). Microbiological and biochemical changes during the composting of oil palm empty-fruit-bunches. Effect of nitrogen supplementation on the substrate. doi
  76. (2003). Modeling carbon and nitrogen dynamics in a bare soil with and without straw incorporation. doi
  77. (2004). Nalivata PhD Thesis
  78. (1997). Nalivata PhD Thesis Cranfield University 7-11
  79. (1998). Nalivata PhD Thesis Cranfield University 7-2
  80. (1998). Nalivata PhD Thesis Cranfield University 7-4
  81. (1994). Nalivata PhD Thesis Cranfield University 7-9
  82. (1994). Nitrogen and carbon mineralization rates of composted manures incubated in soil. doi
  83. (2004). Nitrogen and phosphorus dynamics in co-composted yard trimmings and broiler litter. doi
  84. (1997). Nitrogen dynamics and root distribution of Gliricidia sepium and Senna spectabilis in maize (Zea mays) – based ally cropping systems in Malawi.
  85. (1998). Nitrogen dynamics in maize (Zea mays) and pigeon pea (Cajanas cajan) intercropping in Malawi.
  86. (1998). Nutrient flows and balances as indicators of productivity and sustainability in sub-saharan African agroecosystems.
  87. (2003). On-farm composting methods by
  88. (1994). Organic and conventional management effects on biologically active organic matter pools. doi
  89. (1989). Organic input management in tropical agroecosystems. In:
  90. (2001). Organic inputs for soil fertility management in tropical agroecosystems: application of an organic resource database. doi
  91. (1998). Phosphorus fixation – the good and bad of it.
  92. (1985). Phytotoxins during the stabilization of organic matter. In: Composting of agricultural and
  93. (2005). Producing fortified compost from crop residues: Organic resource management in Kenya. Perspectives and Patson C. Nalivata PhD Thesis Cranfield University 7-10 guidelines.
  94. (2004). Progress in lifting soil fertility in southern Africa.
  95. (2005). Recovery of maize seedling growth, development and photosynthetic efficiency after initial growth at low temperature. doi
  96. (1997). Replenishing Soil Fertility in Africa. doi
  97. (1998). Residue quality and management effects on microbial properties and crop residue decomposition. doi
  98. (2003). Respiration profiles in monitoring the composting of by-products from the olive oil agro-industry. doi
  99. (2002). Response of Grain Legumes to Phosphorus and Sulphur Fertilization in Maize-Legume Short term Rotation System in Malawi. Thesis Submitted in Partial fulfilment of the requirements for a degree of Master in Soil Science,
  100. (1990). Sedimentation by pipette method.
  101. (1981). Soil and soil amendments.
  102. (1973). Soil Conditions and Plant Growth. (10 th Edn).
  103. (2002). Soil fertility and hunger in Africa. doi
  104. (1997). Soil fertility experimentation and recommendations for drought-prone regions of Zimbabwe and Malawi. In: Risk Management for Maize Farmers in Drought-Prone Areas of Southern Africa:
  105. (1997). Soil fertility management in the smallholder maize-based cropping systems of eastern and southern Africa. In: The emerging maize revolution,
  106. (1996). Soil fertility management research for the maize cropping systems of smallholders in southern Africa: A review.
  107. (1997). Soil fertility Patson C. Nalivata PhD Thesis Cranfield University 7-12 replenishment in Africa: An investment in natural resource capital. doi
  108. (1992). Soil fertility research in Malawi: A review. Crop production Department, Bunda College of Agriculture,
  109. (2000). Soil improvers and growing media – Determination of pH. doi
  110. (1999). Soil improvers and growing media, sample preparation for chemical and physical tests, determination of dry matter content, moisture content and laboratory compacted bulk density. doi
  111. (2001). Soil improvers and growing media. Extraction of calcium chloride/DTPA (CAT) soluble elements. doi
  112. (1987). Soil Management: Compost production and use in Tropical and sub-tropical environments.
  113. (1989). Soil microbiology and biochemistry, doi
  114. (1998). Soil nutrient status of smallholder farms in Malawi. doi
  115. (1973). Soil organic matter and its role in crop production. doi
  116. (1984). Soil organic matter and structural stability: Mechanisms and implications for management. doi
  117. (1994). Soil science: Methods and applications. Longman Scientific and Technical, doi
  118. (1986). Soil surface management in the tropics for intensive land use and high and sustained productivity. doi
  119. (1982). Soil survey laboratory methods.
  120. (1984). Statistical procedures for agricultural research. 2 nd edition. doi
  121. (2003). Suppressing soil-borne diseases with residue management and organic amendments. doi
  122. (2003). Test methods for the examination of composts and composting. The US composting council, US Government printing office.
  123. (1986). The analysis of agricultural materials - preparation of sample solution of plant material by dry combustion.
  124. (1990). The Biology and Fertility of Soils:
  125. (2001). The effect of all-arable organic rotations on soil organic matter levels and the phosphorus and potassium status over the period 1987-1998. In: Sustainable management of soil organic
  126. (1996). The effect of applied phosphorus on biological nitrogen fixation by beans. Workshop Proceedings,
  127. (1983). The effects of ammonia and ethylene oxide in animal manure and sewage sludge on the seed germination and root elongation of Brassica parachinensis. doi
  128. (1998). The effects of organic amendments on the restoration of a disturbed coastal sage scrub habitat. doi
  129. (1994). The importance and management of soil organic matter in the tropics.
  130. (1962). The Physical Environment of Northern Nyasaland: Special reference to soils and agriculture. Government Printer, doi
  131. (1993). The practical handbook of compost engineering.
  132. (1996). The Q10 relationship of microbial respiration in the temperate forest soil. doi
  133. (1999). The role of feed composition on the composting process. 1. Effect on composting activity. doi
  134. (1997). The science of composting. doi
  135. (1994). Tillage and crop residue management effects on losses of chemical from soils. doi
  136. (2000). Towards an integrated soil fertility management in Malawi: incorporating participatory approaches in agricultural research. Managing Africa’s soils,
  137. (1991). Toxic effects of manure, alfalfa and ammonia on emergency and growth of cucumber seedlings.
  138. (1993). Tropical soil biology and fertility: A handbook of methods. doi
  139. (1991). Understanding the process In: Staff of BioCycle (Eds.). The BioCycle guide to the art and science of composting.
  140. (2001). Use of compost to improve soil properties and crop productivity under low input agricultural system in West Africa. doi
  141. (1975). Water potential and respiration of micro-organisms in the soil. doi
  142. (1991). Wheat yield depression associated with conservation tillage caused by root pathogens in the soil not phytotoxins from the straw. doi

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