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The Study on Slowly-release Effectiveness of Urea Effected by Water Retaining Agent

Author: GuoJianFang
Tutor: WangYueZuo
School: Shanxi Agricultural University
Course: Soil
Keywords: Aquasorb Saving benefit Slow release nitrogen fertilizer Nitrogen utilization
CLC: S482.9
Type: Master's thesis
Year: 2005
Downloads: 283
Quote: 1
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Abstract


In order to solve the shortage of water resources in dry farming areas, fertilizer use efficiency and low test millet pot experiment, the retaining agent of fertilizer the slow fertilizer effect and fertilizer coupling effects were studied for the development of slow-release fertilizer to improve fertilizer use rate provide a scientific basis. The test made the following conclusions: 1. Determination of the agent and interaction of urea nitrogen dissolution rate, water retention agent can delay the release of nutrients of urea nitrogen fertilizers play an urgency with mercy, and to reduce the loss of fertilizer nutrients purposes. Paul water retaining agent in the slow-release fertilizer still has water absorption capacity, water retention slow-release fertilizer can effectively prevent the loss of soil moisture and evaporation, to promote crop water supply, to achieve the role of soil moisture and drought. With the improvement of the salt concentration of the solution, aquasorb water absorbency have different degrees of reduction. 3 slow-release fertilizer into the soil water retention, with the increase in water retention dose contained, field capacity and available water showed an upward trend. And makes larger than 1mm size of the aggregates increased the proportion of these aggregates have better stabilize the soil structure, improve soil permeability, prevent soil crust, reduce soil surface evaporation. 4 water retention slow-release fertilizer the interaction of the the Mediator agent and fertilizer, to promote the growth of the crop: the millet plant height, leaf area, to enhance the photosynthetic rate, chlorophyll content, which laid the foundation for high yield and quality of millet. From the biological and economic yield performance, application of water retention slow-release fertilizer processing millet yield. Water retention more appropriate ratio combination of slow-release fertilizer mediator agent and urea per kilogram of soil application of 0.173 g of urea plus 0.032 g aquasorb of (B 2 N 2 ) this treatment received the highest biological and economic yield. Visible the reasonable formula water retention slow-release fertilizer to play the purpose of water retention and fertilizer to improve crop yields. Analyzed from the point of view of the nitrogen utilization, water retention slow-release fertilizer to improve the utilization of nitrogen in nitrogen, nitrogen fertilizer utilization rate of more than 40%, which application of 0.346 g of urea per kilogram of soil water retention plus 0.032 g agent (the B 2 N 2 ) processing the highest nitrogen use efficiency of 61.39%. Visible water retention slow-release fertilizer does play a slow release of nutrients, improve fertilizer use efficiency.

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