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Effects Of Sulfur-and Polvmer-coated Controlled-release Urea On Growth Of Wheat

Posted on:2013-05-30Degree:MasterType:Thesis
Country:ChinaCandidate:F L MaFull Text:PDF
GTID:2233330374993666Subject:Soil science
Abstract/Summary:PDF Full Text Request
China’s major grain-producing areas, Huang-Huai-Hai Plain, in which there are oneproblem of long-term excessive amounts of nitrogen fertilizer with food production, causingthe soil fertility decline, reducing crop yield and quality and nitrogen use efficiency,ecological environment degradation and other serious problems. Wheat field experiment wasconducted to study the effects of sulfur-coated controlled-release urea and polymer-coatedcontrolled-release urea on topsoil nutrients, soil profile characteristics of nutrients, wheatyield, grain quality, nitrogen use efficiency, and economic and ecological benefits. It isprovided the theoretical and practical support for the popularization and application of sulfur-coated controlled-release urea and polymer-coated controlled-release urea and the sustainabledevelopment of agriculture. The main results were as followed:1. Compared with sulfur coated controlled release urea, polymer coated controlledrelease urea continues to maintain nitrogen on the topsoil validity among the wheat growthperiod, the contents of soil total nitrogen, nitrate nitrogen and ammonium nitrogen in thetopsoil increase by0.70%~5.05%,1.05%~12.89,0.50%~9.26%, respectively. Reducing theloss of soil nitrogen from the soil profiles by0.47%~3.12%of soils total nitrogen. Makingthe nitrate nitrogen and ammonium nitrogen accumulation under the topsoil (20-100cm)decrease by5.97%~8.03%and2.16%~4.36%, respectively. And the effectiveness of soilphosphorus and potassium will be maintaining. To some extent, applying polymer-coatedcontrolled-release urea could increases the wheat absorption of phosphorus and potassium.2. Compared with sulfur coated controlled release urea, polymer coated controlledrelease urea increases spikes per square meter, kernels per ear,1000-grain mass, and producesbetter wheat yield, the grain yield by0.12%~1.69%. Polymer coated controlled release ureaimproves grain protein and starch contents by2.45%~3.27%and0.08%~0.98%, respectively.And N use efficiency effectively is improved by17.73%~21.24%, N partial factorproductivity by0.14%~1.67%, with the soil nitrogen dependent rate being reduced by10.13%~10.29%.3. Compared with sulfur coated controlled release urea, the economic benefit of thepolymer coated urea increases by1.01%. The polymer coated urea effectively reduces theNO3--N amounts of leaching down from the topsoil by0.38%~10.87%, reducing the possibility of nitrate nitrogen pollution to groundwater environment and bringing a goodecological benefit.4. In this experiment, polymer coated controlled release urea is reflected a better effect ofsoil chemistry properties, wheat yield and quality, N use efficiency and influence of economicand ecological benefits than sulfur coated controlled release urea, and has a furtherapplication value.
Keywords/Search Tags:Sulfur-coated controlled-release urea, Polymer-coated controlled-releaseurea, Wheat, Effects of fertilizer, Nitrogen use efficiency, Benefits analysis
PDF Full Text Request
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