Establishment And Application Of Maize Fertilization Index System In Shouyang County

Corn is China’s first major grain crops, is an important foodcrop and main feed source, its nutrition is rich, the highestgrain crop is the world total output. Considering the factors of different climate feature, soil types and soil nutrient status such as the establishment of corn fertilization index system, has the vital significance to the soil fertilization and improving farmland ecological environment under the guidance of maize. In this paper, Shouyang Countymultiple years corn field fertilizer experiment on yield,based on the data, soil fertility and Fertilizer on Maizeseason when the utilization ratio of the relationship, to establish the principle of nutrient balance index system of Shouyang county corn fertilizing basis, soil nutrients were determined based.To find out the soil nutrient status of cultivated land inShouyang county. The determination results of the county in 3043 sampling points showed that the average content of soil organic matter, total nitrogen content of cultivated land is 12.7g/kg;the average was 0.72g/kg;the average content of alkaline hydrolysis nitrogen was 26.3mg/kg; the average content of available phosphorus was 12.39mg/kg;the average content of available K was 134.46mg/kg; the average content of slowly available potassium was 585.8mg/kg; the average content of available copper was 1.24mg/kg; the average content of effective zinc is 1.39mg/kg; the average content ofFe 5.49mg/kg;available manganese average was 12.24mg/kg; the average content of available boron was 0.46mg/kg; the average content of available molybdenum is 0.08mg/kg;the average content of available sulfur is 45.85mg/kg.The establishment of Shouyang county corn soil nutrient index system. Through correlation analysis of each testpoint relative yield and soil nutrient determination value, in accordance with the actual situation of relative yield, soil nutrient is divided into "high," high "," medium "," low "," low"five grades, initially established the" Shouyang County of Maize in dryland soil nutrient index system".Corn phosphorus abundance index function:Y=3.9451n(x)+77.144R2=0.9217Abundance and deficiency indices of corn potassium letter:Y=4.22791n(x)+72.649R2=0.7559Determination of nitrogen phosphoruspotassium fertilizer recommendationPotash fertilizer recommendation according to the amount of available potassium content of corn nitrogen test areaand optimum fertilizer rate fitting equation, to calculate thesoil available K content was 100,140,180 and 220mg/kgwhen the optimum amount of fertilizer is respectively 167,135,111 and 92kg/hm2. At the same time, the 43 highesttest points of potash fertilizer is 167～248kg/hm2, the average value of 217kg/hm2, so 217kg/hm2 recommended fertilization quantity limit for low grade of soil.Phosphorus fertilizer recommendation fertilization amountaccording to the test area of effective phosphorus content and phosphorus fertilization corn best fitting equation,calculate the content of available phosphorus in soil was 5,10,20 and 30mg/kg optimum amount of fertilizer was 102,83,63 and 52kg/hm2 respectively. At the same time, the 47 highest test points P fertilizer amount was 68～135kg/hm2, the average value of 119kg/hm2, so119kg/hm2 recommended fertilization quantity limit for lowgrade of soil.Nitrogen fertilizer recommendation according to the amount of available potassium content and corn fertilizertest area optimum amount of fertilizer fitting equation, the calculation of soil alkali hydrolyzable nitrogen content of 30,50,70 and 90mg kg～1 when the optimum amount of fertilizer is respectively 141,116,100 and 87kg/hm2. At the same time, the 50 highest test points of nitrogenfertilizer is 68～270kg/hm2, the average value of 173kg/hm2, so 173kg/hm2 recommended fertilization quantity limit for low grade of soil.