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[Objective] The aim of this paper was to provide a theoretical relerence for the application of loss-control urea in rice production in yellow soil. [Method] Based on the same application rates of phosphorus and potassium fertilizer, the rice cultivar Leyou 58 was employed to explore the ellects of loss-control urea, with various adding amount of loss-control agent (1 %,2%,3%,4%,5%,6%), on rice yield, nutrients uptake and utilization. Meanwhile, no nitrogen and common urea fertilizer were taken as the controls. [Result] No regular changes of rice yield observed with increasing the dosage of loss-control agent, while the accumulation of nitrogen in rice grain, nitrogen, phosphorus and potassium in rice straw, and potassium in aboveground parts showed regular variation. At the same time, regular changes were also observed on rice nitrogen, phosphorus, potassium harvest index and potassium absorption efficiency. Compared with common urea treatment, six kinds of loss-control urea with the loss-control agent of 1 % -6 % could increase the rice yield in some degree, among which 1 % adding amount performed the best. The yield increasing rate was up to 12.22 %. The adding amounts of 1 % , 2 % and 6 % enables absorption of nitrogen, phosphorus, potassium by rice and accumulation in the rice seeds sufficiently to promote the yield and quality of rice. The adding amount of 3 % enhanced the accumulation of nitrogen, phosphorus and potassium in rice straw, increased the resistance and promoted the growth. [Conclusion] To sum up, the effect of urea with 1 % loss-control agent performed the best in rice production. [ABSTRACT FROM AUTHOR]

【Objective】 The test aimed to research the influences different new-type nitrogenous fertilizers have on Guizhou’s rice output, biomass, nutrient uptake and utilization and their roles in the saving fertilizer but increasing yield in the process of growing rice, from which to get the most suitable new-type nitrogenous fertilizers for rice growing of the mountainous areas of Guizhou. 【Method】 A field contrast experiment taking Leyou 58(a rice variety) as experimental material with different fertilization plans of common urea and four new nitrogen fertilizers was conducted. 【Result】 Compared with common urea treatment, the new-type nitrogenous fertilizers treatment could improve the component of rice yield to some extent, and could increase the rice output and parts of aboveground biomass, and the rice could have the highest increase rate and grain biomass by humic acid urea treatment, the number was 16. 28 % and 84. 44 g/hole respectively;The lost control urea, humic acid urea, the topdressing of the lost control urea or the common urea with equal zinc fertilizer could increase part of accumulation nitrogen, phosphorus, and potassium, and humic acid urea treatment could make the rice nutrition accumulate more in the rice grain;What’s more, through which the rice could have the best compositive expression of nitrogenous fertilizers utilization efficiency, partial fertilizer productivity, nutrient harvest index, nutrient absorption efficiency, nitrogenous fertilizers agronomic efficiency, and all of these improved the rice’s absorption and utilization of nutrients. 【Conclusion】 The application of urea humic acid in rice area of Guizhou had the best effect. [ABSTRACT FROM AUTHOR]