Author(s):

Pawar SK, GA Kumbhar and PN Sangale

Abstract: The present investigation was carried out to study the effect of various crop residues and green manuring on soil properties and yield of cotton in salt affected soils of purna valley. The experiment was conducted on farmers field at kutasa during 2015-16 comprising cotton-green gram-cotton-green gram-cotton rotation in RBD with nine treatments and three replications. The experiment comprises various green manuring, crop residues and biomulch treatments. The results of the present experiment indicate that various green manuring treatment significantly decreased the pH value over initial status, whereas electrical conductivity was increased under almost all the treatments over initial status. The status of organic carbon (6.32 & 5.44 g kg-1) was improved with the green manuring of sunhemp in surface and subsurface of soils, respectively. The bulk density and mean weight diameter was slightly improved with dhaincha in situ green manuring as compared with control. The application of in situ dhaincha green manuring significantly increased available N (249.90 kg ha-¹), P2O5 (30.46 kg ha-¹) and K2O (459.20 kg ha-¹). The in situ green manuring and gypsum @ 2.5 t ha-¹ helps in reducing detrimental effect of soluble Na++ cations and some anions (HCO3 – and Cl-) whereas concentration of Ca²+, Mg²+ and K+ was increased. The CEC increased significantly with the sunhemp in situ green manuring over control, however, the difference among various green manuring, crop residues and gypsum treatment were non-significant. The exchangeable sodium percentage (ESP) was decreased significantly with the application of gypsum @ 2.5 t ha-¹ (7.32%). The application of gypsum @ 2.5 t ha-¹ registered highest seed cotton yield (12.29 q ha-¹), cotton stalk (29.68 q ha-¹), root (2.98 q ha-¹) and leaf biomass (11.02 q ha-¹). The same has not been observed in SOC stock, where cowpea in situ green manuring registered highest SOC stock (41.60 Mg ha-¹). The pH and EC of saturate paste extract influenced significantly among various green manuring and crop residues treatments. In general pH was decreased and EC was significantly increased over initial and control treatment. The lowest pH value, however was viz. 8.19 registered in gypsum @ 2.5 t ha-¹ treated plot followed by in situ sunhemp green manuring (8.21). The electrical conductivity was increased with the application of gypsum @ 2.5 t ha-¹, followed by green manuring and crop residues treatments.

Pages: 494-498  |  1235 Views  308 Downloads

Download (483KB)