Relationship between main crop stem carbohydrate to ratoon crop yield

An experiment was conducted to study the effect of integrated nutrient management practices on performance of main and ratoon crops of hybrid rice (Oryza saliva L.) during rainy (/char/7) and winter (rabi) seasons of 1997–98 and 1998–99. In this study, an attempt was made to correlate the carbohydrate concentration in stubbles of main crop at harvest, as influenced by fertilizer-management practices, with ratoon yield. The different fertilizer treatments influenced the sugar and starch content in stubbles significantly during both the years. On an average, the sugar (3.7%) and starch (8.25%) content was maximum in recommended dose of fertilizer (RDF) + sunnhemp treatment. Similarly, the grain yield of main as well as ratoon crops was also maximum with RDF + sunnhemp treatment (7, 142 and 2, 123 kg/ha). The correlation coefficients between grain yield of ratoon crop and sugar and starch content in stubbles of main crop were also significant and positive.