Influence of High Density Planting under Modified System of Rice Intensification on Growth, Root Characteristics and Yield of Rice in the Western zone of Tamil Nadu

摘要

A field experiment was conducted during the late Samba (September-January) season of 2018-19 to evaluate the growth, root characters, and yield of rice due to high-density planting. The soil of the experimental field was clay loam in texture with a neutral reaction. The experiment consisted of eight treatments with different spacing and fertilizer levels such as T_1 - 25cm x 25cm with 100% Recommended Dose of Fertilizers (RDF), T_2 - 25cm x 20cm with 100% RDF, T_3 - 25cm x 15cm with 100% RDF, T_4 - 25cm x 15cm with 125% RDF, T_5 - 20cm x 20cm with 100% RDF, T_6 -20cm x 15cm with 100% RDF, T_7 - 20cm x 15cm with 125% RDF and T_s - Conventional cultivation (20cm x 10cm with 100% RDF) and replicated thrice. The results revealed that significantly taller plants were recorded with all SRI treatments (T_1 to T_7) compared to conventional planting in all the stages except at maturity, which resulted in non-significant results. A reverse trend was noted with leaf area index and straw yield. Root length androot volume of rice were higher in wider planted treatments (T_1, T_4, and T_5) than other closer spaced treatments with the least in T_s. Treatments T_5, T_4 and T_3 produced significantly higher grain yield over other treatments with the minimum in Ts. The results inferred that too wider and too closer spacing levels under the SRI method would lead to a reduction in yield though other growth parameters were recorded more.