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The Utilization Ratio Of Nitrogen, Phosphorus And Potassium Fertilizers In Rice Field
Apr 11, 2016

Nitrogen utilization efficiency of nitrogen fertilizer and follows the utilization of ammonium sulfate, respectively 45.4%, 34.8% urea, ammonium hydrogen carbonate 26.8%. Applying nitrogen in soils where rice, loss of soil residues, part three. N in paddy of loss, a is anti-nitrification process, loss about 10%~15%, highest can up 20% around; II is application method improper, ammonium State nitrogen through volatile loss can up 5%~50%; three is with water got lost, for example Shi into paddy of urea, General after two or three days hydrolysis Hou into for ammonium root ion to was rice absorption and soil colloidal adsorption, if in 24 hours within drainage, nitrogen pigment loss volume can up 10%~20%; four is residues in soil in the of nitrogen except was soil colloidal adsorption outside, also has 10% About is fixing to release by clay minerals.

Phosphate fertilizer utilization of phosphate fertilizer utilization is generally 10%~25%, average 14% was significantly lower than that of nitrogen fertilizer, mainly because of the effect of phosphorus into the soil quickly and iron, aluminium and calcium in the soil as insoluble phosphates (known as chemical fixation). This fixation has its positive side, can reduce losses due to leaching, fixed part of the weak acid soluble phosphorus is available for crops the following year. Rice under the submerged condition enhance phosphorus release, Paddy soil phosphorus levels are higher than the corresponding dry soil.

Utilization ratio of potash fertilizer due to soil clay minerals, moisture conditions and soil effects of acids, alkaline, fixed amount of potassium in soils varies, generally between 11%~77%. Fixing reduces leaching of potassium loss, also released under certain conditions, usually frequent alternate wetting and drying, pH increase, the fixed amount of potassium added.