NUTRIENT AVAILABILITY IN SOIL AND YIELD OF TOMATO AS INFLUENCED BY MANURE SOURCES AND RICE STUBBLE MANAGEMENT
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Date
2020-09
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AAU, Jorhat
Abstract
A field experiment was conducted in ICR farm, AAU, Jorhat from December, 2019 to April, 2020 to evaluate nutrient availability in soil and yield of tomato after winter rice (variety - Ranjit) as influenced by different organic manure sources with and without rice stubble incorporation. The experiment was conducted in a split plot design comprising individual plot size of 2.5 m x 2.1 m with four replications. Rice stubble was either removed or incorporated in the main plot, and each main plot was divided into five sub plots fertilized with different composts or recommended fertilizer dose (RDF). The nutrient management treatments comprised of unfertilized plot, RDF (farmyard manure 2 t ha-1 one week before planting followed by 75:60:60 N:P2O5:K2O kg ha-1 applied at planting, with N in two equal splits), farmyard manure 2 t ha-1 (FYM), poultry manure 2 t ha-1 (PM) and vermicompost 2 t ha-1 (VC). The composts were applied in two equal splits at planting and at 30 days after planting (DAP). The soil pH was significantly higher up to 56 DAP in poultry manure fertilized plots where soil exchange acidity was lowest among all the treatments. The NH4-N and NO3-N contents, and P and K availability in soil was highest with application of RDF, while the lowest values were observed in the unfertilized plot. The NH4-N, NO3-N and available P contents of soil significantly increased in VC and PM applied plots compared to FYM or unfertilized plots and were at par with RDF. However, the available K content of soil was significantly higher in RDF at 28 and 56 DAP compared to all other treatments. The exchangeable cations and soil enzyme activity at 28 DAP and 56 DAP showed significant increase in RDF, PM and VC. The highest tomato fruit yield was observed with RDF, which differed significantly over all the treatments, and was followed by PM and VC fertilized treatments. Incorporation of rice stubbles had a positive effect on nitrogen mineralization, availability of phosphorous, potassium, exchangeable cations, soil enzyme activity and yield of tomato, but the interaction with nutrient management was not significant.