Impacts of different sources of organic manures on soil physico-chemical properties, nutrient balance and yield of rice-greengram cropping sequence under organic farming

Abstract

. To study the soil physico-chemical properties, nutrient balance and yield in lowland rice-greengram cropping sequence under organic farming. The test variety of rice CO(R)48 and the greengram variety (Co 6) were used in the two year cropping sequence under site-specific organic farming condition in comparison with RDF and INM. The field experiment consisted of fourteen treatments which were laid out in Randomized Block Design, replicated thrice and square planting (25 x 25 cm) was adopted, the same layout was maintained for residual rice fallow summer greengram in both the years of study. The soil physical properties like bulk density, particle density, per cent pore space and water holding capacity. Similarly, the soil chemical properties like soil pH, electrical conductivity (EC) and soil organic carbon (OC) content was also recorded after harvest of rice and after the harvest of greengram in the entire cropping sequence. The grain and straw yield of rice and greengram were recorded. Organic carbon content of soil was significantly increased with 100 % RDN through green manure and it was followed by all the other organic treatments. The INM practice and recommended NPK fertilizers were noticed with lesser organic carbon content and the absolute control recorded with the lowest soil organic carbon content in both the years of study. The soil nutrient contents like soil available NPK, uptake of NPK by the crop and the nutrient balance (NPK balance) in the rice-greengam cropping sequence were also recorded. The less bulk density and more per cent pore space and water holding capacity values were recorded in all the organic treatments and the INM imposed treatment recorded at par values of the 100% RDN through green manure treatment and the higher bulk density and lesser per cent pore space and water holding capacity was recorded with RDF treatment. The soil available NPK and uptake of NPK at harvest of rice, was higher recorded with INM practice followed by RDF treatment, whereas among the organic treatments, 100% RDN through green manure followed, by 25% RDN through each organic manures combination recorded more soil available and uptake of major nutrients in both the years of experimentation. Similar trend was noticed in grain and straw yield of rice and greengram during both the years of study. The N and P balance at the end of the cropping system was positive in all the treatments except the absolute control, whereas the negative K balance was noticed in the entire cropping system.

Influence of Integrated Nutrient Management Practices on Soil Fertility and Yield of Fodder Maize in Chennai

“…Higher nutrient availability in the organic manures such as poultry manure might be due to continuous and slow release of nutrients from organic manure and increased biomass and accumulated soil organic matter. Similar findings were also reported by Alagappan and Venkitaswamy [20]. Application of farm yard manure for the fodder maize resulted in lower quantity of soil available nutrients followed by no application of organic manures to the fodder maize.…”

Effect of application of FYM or Micronutrient with RDF on soil’s physico-chemical properties in direct seeded basmati rice at Kaithal district, Haryana, India

“…Lowest bulk density was observed in treatment T 4 (50% RDF + FYM @ 15 t ha -1 ) and T 3 (75% RDF + FYM @ 15 t ha -1 ). Decrease in bulk density with the application of FYM because it increases soil porosity and soil aeration (Sankaramoorthy et al, 2017)…”