Comparative effect of organic and inorganic sources of nutrients on yield, soilproperties, and economics of wheat under rice-wheat cropping system

A field experiment was conducted to evaluate the effect of various organic nutrient sources on wheat production, soil properties and economics of wheat crop at Kurukshetra, Haryana, during the rabi season of 2018-19. The experiment was laid out in a completely randomized block design with a total of eight treatments based on different organic nutrients sources. Experimental results demonstrated that yield contributing parameters such as the number of effective tillers, grains per spike, test weight and spike length were significantly higher in T7 (RDF) followed by in T2 (FYM @ 15 t/ha), T1 (Vermicompost @7.5 t/ha) and other cow-based nutrient sources. Significantly higher net returns (₹ 31508 /ha) and Benefitcost ratio (1.39) were documented in T7 followed by in T1 and T2, respectively. Application of different organic formulations significantly improved microbial count (total bacterial, total fungi, azotobacter, phosphorus solubilizing bacteria and potassium solubilizing bacterial count) in the soil rhizosphere over the inorganic source of nutrients. Due to stimulation of soil microbial activity by the application of various organic nutrient sources significantly improved the available NPK status of the soil and biological activity in the soil. Among various organic treatments, the highest available nitrogen and phosphorous were recorded under vermicompost applied plots whereas, the highest available potassium was recorded in Farm Yard Manure (FYM) treated plots. Hence, organic sources can be a suitable alternative over inorganic nutrient sources to sustain crop yield and productivity of the soil over a longer period of time

Germination ecology of hairy fleabane (Conyza bonariensis) and its implications for weed management

Hairy fleabane [Conyza bonariensis(L.) Cronquist] is a problematic weed in Australian no-till cropping systems. Consequently, a study was conducted to examine the effect of temperature, light, salt stress, osmotic stress, burial depth, and sorghum crop residue on germination and emergence in two populations (C and W: collected from chick pea [Cicer arietinumL.] and wheat [Triticum aestivumL.] fields, respectively) ofC. bonariensis. Both populations were able to germinate over a wide range of alternating day/night temperatures (15/5 to 35/25 C); however, the C population had optimum (and similar) germination over the range of 20/10 and 30/20 C, while the W population showed maximum germination at 25/15 C. A negative relationship was observed between osmotic potential and germination, with 31% and 14% germination of the C and W populations at -0.6 MPa, respectively. These observations suggest that population C was more tolerant to higher osmotic potentials than population W. Seeds of both populations germinated when exposed to a wide range of sodium chloride levels (NaCl, 0 to 200 mM); however, beyond 200 mM NaCl, no germination was observed in either population. Maximum germination of the C (70%) and W (41%) populations was observed on the soil surface with no emergence from a burial depth of 1 cm. The application of sorghum residue at an amount of 6,000 kg ha(-1)reduced emergence of the C and W populations by 55% and 58%, respectively, compared with the no-residue treatment. Knowledge gained from this study suggests that the following strategies could be used for more efficacious management ofC. bonariensis: (1) a shallow-tillage operation to bury weed seeds in conventional tillage systems, and (2) retention of sorghum residue on the soil surface in no-till systems

Influence of soil moisture levels on the growth and reproductive behaviour of Avena fatua and Avena ludoviciana

Adaptation of weeds to water stress could result in the broader distribution, and make weed control task increasingly difficult. Therefore, a clear understanding of the biology of weeds under water stress could assist in the development of sustainable weed management strategies. Avena fatua (wild oat) and A. ludoviciana (sterile oat) are problematic weeds in Australian winter crops. The objectives of this study were to determine the growth and reproductive behaviour of A. fatua and A. ludoviciana at different soil moisture levels [20, 40, 60, 80, and 100% water holding capacity (WHC)]. Results revealed that A. fatua did not survive and failed to produce seeds at 20 and 40% WHC. However, A. ludoviciana survived at 40% WHC and produced 54 seeds plant-1. A. fatua produced a higher number of seeds per plant than A. ludoviciana at 80 (474 vs 406 seeds plant-1) and 100% WHC (480 vs 417 seeds plant-1). Seed production for both species remained similar at 80 and 100% WHC; however, higher than 60% WHC. Seed production of A. fatua and A. ludoviciana was 235 and 282 seeds plant-1, respectively, at 60% WHC. The 60% WHC reduced seed production of A. fatua and A. ludoviciana by 51 and 32% respectively, compared to 100% WHC. The plant height, leaf weight, stem weight, and root weight per plant of A. fatua at 60% WHC reduced by 45, 27, 32, and 59%, respectively, as compared with 100% WHC. Similarly, the plant height, leaf weight, stem weight, and root weight per plant of A. ludoviciana at 60% WHC reduced by 45, 35, 47 and 76%, respectively, as compared with 100% WHC. Results indicate that A. ludoviciana can survive and produce seeds at 40% of WHC, indicating the adaptation of the species to dryland conditions. The results also suggest that A. ludoviciana is likely to be robust under water stress conditions, potentially reducing crop yield. The ability of A. fatua and A. ludoviciana to produce seeds under water-stressed conditions (60% WHC) necessitates integrated weed management strategies that suppress these weeds whilst taking into account the efficient utilization of stored moisture for winter crops

Comparative effect of organic and inorganic sources of nutrients on yield, soil properties, and economics of wheat under rice-wheat cropping system

685-694A field experiment was conducted to evaluate the effect of various organic nutrient sources on wheat production, soil properties and economics of wheat crop at Kurukshetra, Haryana, during the rabi season of 2018-19. The experiment was laid out in a completely randomized block design with a total of eight treatments based on different organic nutrients sources. Experimental results demonstrated that yield contributing parameters such as the number of effective tillers, grains per spike, test weight and spike length were significantly higher in T7 (RDF) followed by in T2 (FYM @ 15 t/ha), T1 (Vermicompost @7.5 t/ha) and other cow-based nutrient sources. Significantly higher net returns (₹ 31508 /ha) and Benefitcost ratio (1.39) were documented in T7 followed by in T1 and T2, respectively. Application of different organic formulations significantly improved microbial count (total bacterial, total fungi, azotobacter, phosphorus solubilizing bacteria and potassium solubilizing bacterial count) in the soil rhizosphere over the inorganic source of nutrients. Due to stimulation of soil microbial activity by the application of various organic nutrient sources significantly improved the available NPK status of the soil and biological activity in the soil. Among various organic treatments, the highest available nitrogen and phosphorous were recorded under vermicompost applied plots whereas, the highest available potassium was recorded in Farm Yard Manure (FYM) treated plots. Hence, organic sources can be a suitable alternative over inorganic nutrient sources to sustain crop yield and productivity of the soil over a longer period of time