Growth and productivity of kharif rice (Oryza sativa L.) as influenced by cropping sequences and fertility levels in hill zone of Karnataka

摘要

A field experiment was conducted during the kharif and summer seasons of 2002-03 and 2003-04 at Mudigere, situated in hill zone of Karnataka, to study the influence of cropping sequences and fertility levels on physiological parameters in relation to yield of kharif rice (Oryza sativa L.). Rice-soybean cropping sequence resulted in better physiological parameters like dry matter production (DMP), leaf area per plant (cm(2)), leaf area index, net assimilation rate and relative growth rate and was found significantly superior over other cropping sequences. Among the fertility levels, application of 100% recommended dose of fertilizer recorded significantly the higher growth indices values in all the cropping sequences as compared to control. The grain and straw yield of kharif rice was significantly higher when it was preceded by soybean (5258.0 an d 7879.0 kg/ha, respectively) and the lowest was in rice sequenced with fodder maize (3934.5 and 5893.0 kg/ha, respectively) during both the years of investigation. The application of 100% RDF resulted significantly in higher grain and straw yield (4858.0 and 7234 kg/ha, respectively) which was on par with the combined use of 50% RDF+5.0 t Chromoleana odorata compost (4707 and 7004.0 kg/ha, respectively).