Evaluation of four improved soybean varieties under different planting date in relayed cropping system with maize under soybean/maize/cassava intercrop

Field experiments were conducted at Ibadan; Southwest Nigeria in 2001 and 2002 to evaluate the effects of relayed intercropping of four improved soybean varieties with maize in soybean/maize/cassavaintercropped. Intercropping depressed maize grain yield and cassava fresh tuber yield. The response observed in the yields of maize and cassava under different soybean varieties in intercropping systemswith maize and cassava was not significant. Soybean plant height at harvest, number of days to 50 percent flowering, number of pods per plant, weight of 100 seeds and seed yield were significantlyaffected by intercropping systems. Soybean variety TGX 1019 – 2E gave the highest values (66.69, 20.73 g and 1.02 t/ha) for number of pods per plant, weight of 100 seeds and seed yield, respectively,under intercropping systems. The response observed in 2001 and 2002 was significant for weight of 100 seed and seeds yield. The higher values (18.53 g and 0.87 t/ha) were obtained for 2001 compared to that of 2002. The number of weeds per 1 m x 1 m guardant significantly varied among intercropping systems. Cassava/soybean relayed with maize under intercropping system gave the least values (50.29and 35.63) at 5 and 7 weeks after sowing respectively. Among the four improved soybean varieties evaluated under intercropping, TGX 1019 – 2E and TGX 1448 – 2E gave the least values at 7 and 9 weeks after sowing

Growth and yield performance of some improved soybean varieties as influenced by intercropping with maize and cassava in two contrasting locations in Southwest Nigeria

Four improved varieties of soybean (TGX 1448-2E, TGX 1445-2E, TGX 1485-1D and TGX 1019-2E) were evaluated for growth and yield performance under intercropping system with maize and cassava atIbadan and Oniyo in 2001 and 2002. Plant height at harvest, number of pods per plant, weight of 100 seeds and seed yield were used to assess the performance of improved varieties of soybean while grain yield and fresh tuber yield were considered for maize and cassava under the intercropped. Combined analysis of variance of growth and yield parameters showed variations among improved varieties of soybean, maize and cassava for intercropping, location, year and their interactions. Soybean variety TGX 1485-1D with highest number of pods per plant, weight of 100 seeds and seed yield was the most desirable variety for intercropping with maize and cassava across the two locations. Maize grain yield and cassava fresh tuber yield were similar among the four improved varieties of soybean in their response under the intercropped across the two locations. Higher seed yields ofsoybean varieties were obtained from Oniyo (derived savanna agro ecology) compared to Ibadan (rain forest agro ecology) probably due to differences in climatic conditions. The study has indicated thatTGX 1485-1D, which was highest yielding across the different locations, will fit well into the farming systems of small-scale farmers of Southwest Nigeria

Influence of poultry manure and NPK fertilizer on yield and yield components of crops under different cropping systems in south west Nigeria

Field experiments were conducted in two villages (Oniyo and Moloko Ashipa) representing two agro ecologies in the south west area of Nigeria during 2000 and 2001 cropping seasons. The objective was to determine the effects of NPK fertilizer and poultry manure on the yield and yield components in cassava/maize/melon systems. The factors were (1) cropping systems: cassava/maize/melon, sole cassava, sole maize and sole melon; and (2) fertilizers: no fertilizer, NPK 15-15-15 (400 kg/ha), poultry manure (5 t/ha), 2.5 t/ha poultry manure + 200 kg/ha NPK 15-15-15 and mineral fertilizer (NPK 15-15-15). Intercropping had no significant effect on cassava root yield but it reduced maize and melon seed yield compared to sole cropping. Land equivalent ratio (LER) values were however higher under intercropping than sole cropping. Crop yields were statistically the same under NPK alone and NPK + poultry manure but significantly higher than both poultry manure alone and control in both location

Comparative effectiveness of different levels of poultry manure with NPK fertilizer on residual soil fertility, nutrient uptake and yield of maize

The comparative effectiveness of residual effects of 300 kg/ha NPK 15-15-15 fertilizer, 7t/ha poultry manure (Pm), five combinations of reduced levels of NPK 15-15-15 fertilizer and poultry manure, and control (no fertilizer) on soil and plant nutrient uptake and maize yield were investigated in a field trial during the 1996 and 1997 second cropping seasons at the Teaching and Research Farm of the Federal University of Technology, Akure (7o 16” N, 5 o 12”E), Nigeria. The soil type of the trial site was lowly fertile loamy sand. Application of poultry manure, and combinations of poultry manure with NPK fertilizer gave high residual effects on soil chemical composition and increased plant height, leaf area, dry matter yield, plant nutrient uptake and grain yield of maize significantly. Residual effects of poultry manure, and combined application of reduced quantities of poultry manure and NPK fertilizer gave higher soil organic matter, N, P, K, Ca, Mg and micro-elements contents compared to application of 300 kg/ha NPK 15-15-15 fertilizer and control. The residual effects of 3t/ha poultry manure plus 200kg/ha NPK fertilizer and 7t/ha poultry manure produced non-significantly different values. However, the 7t/ha poultry manure had the best residual effects on maize yield and soil fertility. The 3t/ha poultry manure plus 200kg/ha NPK fertilizer is recommended as substitute for 7t/ha poultry manure or 300kg/ha NPK fertilizer. Key words:Poultry manure; NPK fertilizer; residual soil fertility; nutrient uptake; maize yield Moor Journal of Agricultural Research Vol.4(2) 2003: 191-19

Effect of poultry manure, NPK 15-15-15 and combination of their reduced levels on maize growth and soil chemical properties

The comparative effects of 300kg/ha NPK 15-15-15 fertilizer, 7t/ha poultry manure (Pm), six combinations of reduced levels of NPK 15-15-15 fertilizer and poultry manure, and control (no fertilizer) on maize growth, nutrients uptake and soil chemical properties were investigated for two years at Akure, South West Nigeria. Application of poultry manure, and combination of poultry manure and or NPK fertilizer significantly increased soil chemical composition, maize plant dry matter yield, grain yield, plant height, leaf area and nutrients uptake. The highest grain yields were obtained with combined use of NPK fertilizer and poultry manure in 1996 and 1997. The highest values were recorded with combined use of 3t/ha poultry manure and 200kg/ha NPK fertilizer with respect to dry matter yield, grain yield and nutrients uptake in both years. Nigerian Journal of Soil Science Vol. 15 2005: 34-4

Studies on seed yield potential of some selected kenaf (Hibiscus cannabinus L.) genotypes

Kenaf seed yield depends on morpho-physiological traits between varieties, and the interaction between genotype and the environment. Studies were conducted in Ibadan, Ilora and Kisi stations of the Institute of Agricultural Research and Training (IAR&T), Obafemi Awolowo University, Moor Plantation, Ibadan, Oyo State, Nigeria during 2009 and 2010 cropping seasons to determine the influence of location and genotypes on seed yield potentials in 20 kenaf genotypes. The experiment was carried out using Randomized Complete Block Design (RCBD). Result shows that, kenaf plants had tallest average capsule height in Ilora in both years, while higher numbers of capsule/plant and seed number/capsule were recorded in Kishi. There were no significant differences among all the genotypes planted irrespective of the location on seed weight/plant, 100 seed weight and seed yield/ha. Average highest capsule height was recorded in 2009 across genotypes. However, average number of capsule/plant, seed number/capsule, seed weight/plant and seed yield/ha were higher in 2010. Local kenaf had highest number of capsules (55.04) with about the least seeds per capsule (9.45) and least weight of seed per plant (3.30 g). While BS-1 had the least capsule number (18.86) and highest seeds per capsule (15.74) was recorded in SF-549. AU-75 recorded the highest seed weight/plant. The 100 seed weight ranged from 3.37 to 2.19 g. Seed yield/ha across genotypes ranged from 660 kg/ha in Local line 36 to 1454.3 kg/ha in AU-75.Keywords: Kenaf, capsule height, capsule number, seed number, seed weight/capsule, 100 seed weight and seed yield/ha.African Journal of Biotechnology, Vol 13(24) 2420-242

Existing competitive indices in the intercropping system of Manihot esculenta

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