Effect of Humic Acid Water-retaining Agent on Yield Properties of Maize and Albic Soil Nutrients Based on Reducing Fertilizer Application

WANG Nan; BAO Yan; YAO Kai; CHEN Dianyuan; ZHANG Dianxi; SUN Xin; WANG Shuai

doi:10.15933/j.cnki.1004-3268.2017.11.010

Abstract：In order to reveal the application effect of humic acid water-retaining agent (WA) under the condition of reducing fertilizer,no fertilizer(CK) used as a blank control,the treatments of total fertilizer (Tf),decreasing N fertilizer 20％ (Df-N 20％),decreasing P fertilizer 20％ (Df-P 20％),decreasing K fertilizer 20％ (Df-K 20％),and respectively combined with WA(Tf-WA,Df-N 20％-WA,Df-P 20％-WA and Df-K 20％-WA) were set to explore their effects on the yield properties of maize and albic soil nutrients.The results were as follows:the emergence rate of maize,total leaf number during the grain filling stage,plant height,leaf area of single leaf,grain number per spike and yield treated by fertilization significantly increased compared with CK.Based on Df-N 20％ and Df-K 20％ treatments,the application of WA could increase the corresponding maize yields by 9.4％ and 13.4％,respectively.On the contrary,based on the Tf and Df-P 20％ treatments,combined application of WA could obviously decrease their yields.The Df-P 20％ and Df-P 20％-WA treatments could further aggravate the acidification of albic soil and decrease the pH value by 3.7％ and 3.1％,respectively.Compared with the maize jointing stage,the organic matter contents treated by Df-K 20％,Tf-WA,Df-P 20％-WA and Df-K 20％-WA on the harvest time,the increasing rate were 2.5％,2.1％,6.3％ and 4.4％,respectively,on the contrary,the other treatments were all bad for the accumulation of organic matter content,among which the consumption degree of organic matter content in the Df-N 20％-WA treatment was the greatest,reaching 28.3％.Compared with the jointing period,apart from CK treatment could make the total N content stable,all the other treatments could decrease the total N content to varying degrees.From the extent of reduction,based on Tf and Df-K 20％ treatments,the applied WA could ease the downtrend of total N content,however the Df-N 20％ and Df-P 20％ treatments could increase their consumption of total N contents under the same conditions.On the basis of the fertilizer,the combined application of WA had no regular effect on the available N,however,the Df-K 20％-WA treatment could alleviate the downward trend of available N to a certain extent and enhance the available P content of albic soil.The Df-K 20％ treatment could effectively promote the accumulation of available N contents.Except the filling stage of corn,the WA could make the available P content significantly enhance compared with no WA at the other four stages of growth.Different fertilization treatments amended with WA were all beneficial to the consumption of available K content of albic soil in the mature period and harvesting time.In conclusion,based on the decreasing N fertilizer 20％ or decreasing K fertilizer 20％,the combined application of WA could increase the corn yield,in which the former was not good for the accumulation of organic matter in albic soil;The soil acidification process could be accelerated by reducing P fertilizer 20％,whether or not it was combined with WA;Fertilization could effectively promote the consumption of total N content in albic soil,but did not have the regular effect on the content of available N.