Effects Of Applying Potassium Fertilizer On Soil Properties And Yield Under Straw Incorporation

Straw Potassium has an important role in maize production,different amount of potassium on straw decomposition effect on maize yield,there are also differences,and straw fertilizer potash fertilizer has good effect on soil fertility.To increase the effect of K Fertilization on crop straw in the condition of soil fertility,using Zhengdan 958 as tested varieties,set up 5 levels of potash fertilizer(K1:0 kg/hm2;K2:60 kg/hm2;K3:120 kg/hm2;K4:180 kg/hm2;K5:240 kg/hm2),a completely randomized design that systematic study of potassium in different straw incorporation conditions on Soil physical properties,chemical properties and Microbial Characters and yield.has made the following results:1.The straw incorporation treatment can significantly reduce soil bulk density,increase the soil total porosity and capillary porosity,soil field capacity significantly improved,by comparison between straw and straw incorporation,it is found that with the increase of potassium,the difference between each treatment increased,on the one hand is the straw no straw incorporation treatment with the increase of fertilizer significantly increased soil bulk density and other physical indicators in addition have significantly reduced and the other is the straw processing with increasing potassium fertilizer,soil bulk density decreased,other physical indicators have improved,while K4 and K5 appeared in fiction the phenomenon of.2.Straw fertilizer fertilizer on soil chemical properties experiment showed that soil nitrogen content increased with the amount of potassium in the early rising gradually,but in the later period is K2,K3 fertilizer treatment and other treatment was significantly increased;but the concentration of available phosphorus in soil K of treatment K1 was the highest,and decreased with increasing potassium fertilizer,indicating that straw potassium leads to the decrease of soil available potassium content,change trend and alkali content of available potassium in soil between each treatment solution of nitrogen;changes of organic matter content of each treatment showed similar changes,there is a the process of decline in the early,after all is steadily rising trend,which deal with the best effect of K3.3.The straw application of Potassium Fertilizer on soil microbial dynamic experiments show that the number of bacteria with the crop growing period of progressive decline,there are significant differences between each period of treatment,the difference between K3 treatment and other treatment was the most significant,can effectively increase the number of bacteria in the soil and change;the number of bacteria and fungi similar changes;actinomycetes showed a trend of increasing first and then decreasing in the crop,silking stage to reach the highest point in different periods of K3,K4 did not change significantly between treatment with K3 was the best;the number of bacteria in the soil solution of cellulose with crop growth period increased the trend,difference between each period was in the early stage of K4,the most obvious increase in the late K3 treatment to enhance the most obvious.4.Straw incorporation to field application of potash fertilizer has a certain effect on the improvement of crop yield,but it is not absolute.In the experiment of straw incorporation treatment compared with significant improvement of straw incorporation treatment yield,but the yield difference between the amount of potassium was not realized,in K3 production of microbial activity instead of the minimum maximum,indicating that microbial activities affect the absorption of nutrients of crops,resulting in decline.