Study Of Applied Controlled Release Fertilizers On Watermelon

Controlled release fertilizers (CRFS) is a new one which can adjust and control the nutrient releasing, taking organic, inorganic or organic-inorganic compound materials as the carrier. Not only can the term of validity of fertilizer be delayed, but also can its utilization be enhanced by taking CRFS, so CRFS has a broad prospect for development. In the east of Gansu plateau area, applying {3, 3} simple form center of gravity design and 3-11B best superior mixed design testing method study the way of using controlled releases combined fertilizer and controlled release combined urea while planting watermelon, the effect of CRFS on output, output structure, product quality of watermelon and soil nutrient. The main conclusion is as following:First, taking controlled release urea by itself can delay the watermelon period of growth, while taking controlled release combined fertilizer solely can accelerate the ripening of watermelon.Although the bulk and weight of watermelon can be increased by taking D90 and D60, can its maturing be postponed for 6-9 days. In order to sale watermelons on the market in an earlier time, we can cave under the membrane to seed beforehand when using controlled release urea. Using Aidier and Jiaji is much better than using general fertilizer. In the eyes of growing progress, the flowering season can be early and we can get fruits before 3-5 days.Secondly, using either CRFS by itself or different controlled release urea and general urea tie in can not only improve the output, quality, growth and output structure of watermelon obviously, but also enhance the soil fertility and nitrogen utilization while planting watermelon.We can obtain more 39.6%-46.5% output of watermelon when using controlled release combined fertilizer than without using any fertilizer, more 8.8%-14.2% output of watermelon than using general combined fertilizer;more 26.9%-44.9% output of watermelon when using controlled release urea than without using any fertilizer, more 1.45%-15.8% output of watermelon than general combined fertilizer.When we use the same quantity of nitrogen, either soluble sugar content, the Vc content or the total acidity of watermelon is much higher when using any kinds of controlled releaseurea than using general urea by itself;The soil organic substance, the entire nitrogen, effective nitrogen, the fast-acting phosphorus and the fast-acting potassium content can all be arisen remarkably, while nitrate of fruit and soil may be decreased remarkably.Using controlled release urea can enhance the location where a fruit appear, the length of watermelon vine and the weight of single fruit obviously. The weight of single fruit is about 7.11 Kg if we use U-D60-D90 when planting watermelon. This count is also the highest one among all kinds of controlled release urea being used, and the weight is more 27.65% than using general urea.Effective nitrogen can be released in a prestissimo after being taking50-80 days. The nitrogen utilization is the lowest when we only take general urea while the nitrogen utilization is the highest when UD30 and UD60 are taken together correctly. The former is 26.83%,and The later is 53.28%.Thirdly, the regression equation has been established by using the 311-B best superior mix design experiment, and then we has obtained the relation between high production combination and actual pure nitrogen quantity fertilizer by carrying on the optimized analysis. This relation is a basic for the producer who want to know the quantity of taking fertilizer according to the goal output.Forth, the method of applying controlled release urea can affect the output and growth of watermelon obviously: especially ,the effect of the single ridge and two row method is the best, this method can improve watermelon output obviously.In brief: when using CRFS on watermelon, we should better apply the single ridge and two row method. Jiaji Duplicate fertilizer is the best one among them, while taking controlled release urea, we may choose D90.The profit of U-D60-D90 is best while using the fast-acting urea and control-released urea packing with PE .In East of Gansu plateau area, if we want to obtain 70.55-71.421 output per hm2, we must supply N411.38-453.23kg/hm2, P2O5117.77-318.48kg/hm2, K2O102.77~415.71 kg/hm2.