Effect of Combined Application of Organic Manures and Chemical Fertilizers on Availability of Micronutrients and Yield of Sugarcane (Saccharum officinarum L.) in Farmers Fields of Andhra Pradesh

摘要

The results of field experiments conducted on alluvial soils during 1994 - 95 and 1995-96 in farmers' fields of Kovur Sugar Factory area of Nellore district, Andlira Pradesh revealed that sugarcane responds to organic manures when used in integrationwith inorganic fertilizers. An additional cane yield of 14-271 ha~(-1) was realized with different organic manures + inorganic fertilizers over inorganic fertilizers alone. Among different organic sources, FYM and press mud proved superior in terms of cane yield and sugar yield respectively. There was a slight reduction in soil pH and increase in electrical conductivity with the application of organic manures. At the end of ratoon crop, it was found that the increase in available N and Ca was maximum (38.2 and 24.4%) with the application of FYM whereas, application of poultry manure resulted in highest increase in available P (122.2%) and available K (23.6%) and magnesium (47.4%) over initial soil values.