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The Availability, Lability and Mobility of Liquid P Fertilizer on Calcareous Soil under Fertigation Condition

Author: YeZhuang
Tutor: ZuoGuiXin
School: Shihezi University
Course: Plant Nutrition
Keywords: Calcareous soil Liquid phosphate fertilizer The mobility of phosphorus Inorganic Phosphate Fractionation DGT
CLC: S158
Type: Master's thesis
Year: 2010
Downloads: 71
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Abstract


[Objective] Xinjiang drought oasis of solid, liquid phosphorus in calcareous soil mobility and effectiveness, an important mechanism to study the diffusion behavior of liquid phosphate fertilizers in the soil, drip of liquid fertilizer application and phosphate fertilizer utilization significance. Comparative study of solid, liquid phosphorus in the effectiveness of different drip irrigation frequency and mode of application, revealing the activation mechanism fertilizers on soil inorganic phosphorus library, provides new ways and ideas to the efficient use of the calcareous soil phosphate, thus promoting liquid phosphate fertilizer in The Arid Area calcareous soil, improve phosphorus nutritional status of crops in the region. [] 1. Concentric circles diffusion test according to different water and fertilizer to join research mobility and effectiveness of the acid liquid fertilizer and solid fertilizer in calcareous soils of different texture. 2. By Network chamber pot experiment was conducted in accordance with the continuous drip the intermittent drip two drip irrigation frequency, comparative study of solid and liquid phosphate fertilizers in different mode of application, effectiveness and soil inorganic phosphorus library activation mechanism. 3 application DGT (diffusive gradients in thin films) device simulation of roots solid and liquid phosphate fertilizers on soil phosphorus supply capacity. 4 by Jiang Bo Pan Gu Yi early inorganic phosphorus grading with Guppy phosphorus grading method comparison study of soil inorganic phosphorus content of each component of the library and transformation of to reveal soil available phosphorus crop P uptake, which lime Soil phosphorus supply the ability to make a reasonable evaluation. [Results] 1. Decrease soil Olsen-P content with the fertilization point circle within the outer, the fertilizer processing Olsen-P amount in three soil fertilization outside the circle were higher than solid fertilizer treatment. (2) most of the solid fertilizer stay in the fertilization point circle (0 to 7.5 mm), P application rate from 55% to 70% of the total liquid fertilizer content of 0 to 7.5mm layer below the solid fertilizer (about 15 ~ 40%), but away from the point of fertilization after 3 spheres (7.5 to 43 mm) are higher than the processing of solid fertilizers, wherein 7.5 to 13.5mm most obvious (fertilizer accounted for 35%, 20% solid fat) the amount of phosphorus in the sand, loam and clay have shown a consistent variation. Solid, liquid fertilizer can reduce soil pH, but the impact of fertilizers on the soil pH limited only from the point of fertilization of 0 to 7.5 mm range, the pH value was significantly lower than two layers. 4 continuous drip, liquid-phase phosphate fertilizer utilization was 29%, 18% solid phosphate fertilizer; intermittent drip irrigation conditions were as follows: 25% of the liquid fertilizer and solid fertilizer 11.5%. 5 continuous drip, resin-P, Ca2-P and leaf P uptake correlation coefficients were: 0.9365, 0.9218, the stem P uptake correlation coefficients were: 0.9277 and 0.8950. [Conclusion] The liquid phosphorus in calcareous soils mobility, effectiveness was significantly higher than that of solid phosphorus, but had no significant effect on soil pH. Solid, liquid phosphorus source utilization is higher than the one-time application of the split application. Liquid fertilizer processing under maize leaf and stem dry matter was significantly higher than the solid fertilizer treatment. Continuous drip irrigation of corn dry matter content higher than intermittent drip. Whether continuous to drip or intermittent drip irrigation, fertilizer liquid fertilizer processing stage utilization were significantly higher than the solid fertilizer, and solid fertilizer applied once and split application of fertilizer utilization difference was not significant. 4 liquid fertilizer better than the solid fertilizer to improve soil inorganic phosphorus library, available P ratio, control soil is invalid phosphorus ratio. Of Resin-P and phosphorus 5Guppy grading plant P uptake is higher than Jiang Bo Pan, the Gu Yi Chu phosphorus grading Ca2-P.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
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