Cumulative Effect of Different Levels of Manures on the Physical Properties of Soil

This investigation aimed at studying the cumulative effect of different levels of manures and fertilizers on the physical properties of the alluvial sandy loam soils in the permanent manurial trial at Sabour (Bihar). The treatments consisted of the inorganic fertilizers, alone and in various combinations, and farmyard manure at different levels. The organic manures significantly increased the organic matter status of the soils, depending on the dose and time of application. The structural status, water retention and bulk density of the soils were also significantly improved by the treatments with organics-higher the dose better was the improvement. On the other hand, there was very little change in the soil properties due to the application of the inorganics. The yield of maize was significantly and positively correlated with the structural index of the soil except in the case of the treatments without nitrogen.