黑土玉米钾肥定位试验研究

通过探索钾在作物、土壤体系内的循环及秸秆还田对保持农田钾素平衡的作用,为合理施用钾肥提供科学依据。结果表明:连年施钾肥对双城市黑土玉米仍有显著的增产作用;K1和K2处理分别比K0处理增产21.3%和16.7%。由于2008年风调雨顺,玉米产量较高,钾肥增产效果显著;长期不施钾肥土壤钾素含量呈波浪式下降,施钾肥有不同程度增产,可见,适量施用钾肥对提高产量、维持土壤钾素平衡、提高土地持续生产能力具有重要意义。

Potassium Position Experiment of Maize on the Black Soil

The purpose of the study was to explore the function of maize,the cycle within the soil system and straw back to farmland to maintain a balance of potassium in farmland,and to provide a scientific basis for applying potassium fertilizer.The results showed that applying potassium fertilizers in successive years still have significance to maize yield in Shuangcheng.Compared with K0,the treatment of K1 and K2 could increase yield by 21.3%and 16.7%,respectively.Maize yield was higher and the increasing effect of potassium fertilizer on yield was obvious because of good climatic conditions in 2008.The content of potassium presented a wave downward trend in soil where not applying potassium fertilizer for a long time,when applying potassium,the yield was increased in different levels.Therefore,there was significance of applying appropriate potassium fertilizer to improve yield,maintain balance of potassium in soil and improve the sustainable productivity of land.