Saturday, 15 July 2006
166-9

Vermicompost for Sustaining Soil Productivity.

Dhandapni Vasanthi, Tamil Nadu Agricultural Univ (TNAU), Dept of Siol Science& Agricultural Chemistry,, Coimbatore, India

The high yielding varieties of crops can yield to their genetic potentials only if they are grown in productive soils. The soils must be fertile and healthy if they are to be highly productive. Productivity of soils can not be sustained with the fertilizers alone. Though inorganic farming increases the yield of crops it has become hazardous in the long run distorting soil fertility and deteriorating soil health and the quality of the agricultural produces. At the same time complete inorganic farming is not feasible in commercial agriculture. So, the viable and feasible way to improve and sustain soil productivity for maximizing crop production is the integrated Nutrient management (INM) involving manures, fertilizers and bio-fertilizers but the manures have become scarce due to dwindling in the cattle population and inability to introduce the green manure crops in the crop sequences under intensive agriculture. In this context an investigation was carried out to find out the efficacy of vermicompost prepared from different organic wastes like weeds, vegetable wastes, sugarcane trash, banana wastes etc to improve the fertility status of the soil and to increase the yield of rice crop. Field experiments were conducted using vermicompost prepared from different organic wastes at 5& 10 t ha-1 with N,P and K at the recommended levels of 100: 50 : 50 Kg ha of N,P2O5 and K2O HA-1..ADT-36 rice was grown as test crop. The results showed that the rice grain yields were significantly higher in the treatments that received vermicompost at 5 or 10 t ha-1 plus N,P and K at the recommended levels (5.3 t ha-1) than in the treatment that received N,P and K alone(3.7t ha-1) through fertilizers. Organic carbon content (1.48%) and fertility status as reflected in the available status of N,P and K and micronutrients were significantly higher in the treatments that received vermicompost plus N,P and K than in the treatment with N,P and K alone. Significant reduction in bulk density and significant increase in CEC was recorded in the treatments that received vermicompost besides fertilizers. The results showed clearly that application of vermicompost prepared from any organic waste at 5 t ha-1 along with recommended levels on N,P and K can be recommended to improve and sustain soil productivity for maximizing rice production.

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