The Potassium Characteristics Research Of The High Yeild In The Corn Belt Of The Songliao Plain

In this study,we selected high-yielding maize field soil located in lishu county, shengli country, quanyan mountain of the jilin province and yongfa township of gongzhuling city as the research object. Then use the method of combining the field test and laboratory analysis and discussthe corn belt of the songliao plain different profile of soil potassium content status and potential for potassium.The results show that:(1).The potassium reserves and potassium supply capacity of the tested soil in The corn belt of the songliao plain is very high.The total potassium content in0-25cm soil of the high production yield is more than25percent in the control soil. The slowly available potassium content is also rich, But because of climate reason they cannot be timely into effective potassium. Rapidly-available potassium content is moderate in high yield soil.(2).The adsorption character of the tested soil fitting to freundlich equation. High yield soil of the corn belt of the songliao plait contains rich potassium; total potassium and slowly available potassium content is higher and available potassium content is moderate; the potassium adsorption strength of high yield soil significantly greater than its reference soil;0.7341≤1/n≤0.9575;the bound force to the potassium ion of high yield soil is weaker and be beneficial to plant absorption and utilization.(3).The desorption rate to the adsorption potassium between high yield soil and contrast soil has greater differences. The desorption rate of high yield soil in shengli country and quanyan mountain is between62%-17.2%and the contrast soil is between29.2%-15.8%.Following increased concentration of potassium in join liquid, the difference becomes small; when potassium concentration is more than0.56g/L,the desorption rate is close to same. Stated a high concentration of potassium on the effectiveness of the crops in reducing.(4).The research on the potassium fixed of the tested soil shows that, the ability of the high yield to potassium fixed is low. The middle-and-low-yielding fields for exogenous potassium fixed led to potash can’t get the effective utilization and the food production is low. Combining particle composition analysis, proof of the viscous grain content is more, then the exogenous potassium fixed amount in soil is larger.