Property of controlled release fertilizer and its effect on the growth of tobacco

The tung oil of the nature resources extracted from the fruit of tree used as controlled material for producing the controlled-released-fertilizer was studied. The soil incubation experiment was carried out. The nutrient release of controlled released carbamide was studied. The "weight method" was adopted to measure the fertilizer nutrient. The result showed that the preliminary solubility rate of controlled release carbamide is 12.6% in the soil, which dacreased by 69.5% compared with the preliminary solubility rate of nitrogen. The controlled release urea meets the nutrient demands for the growth of tobacco. In comparison with urea and controlled release urea, the dry weight of tobacco plant leaf increased by 5.5 g per plant more using the controlled release carbamide than that using common urea.