Effects of fulvic acid application on maize yield under irrigation in sandy loam soil
In order to investigate the dry matter accumulation and yield formation patterns of maize un-der different irrigation quotas and fulvic acid application modes,a two-factor randomized block design was adopted in this study experiment.Two irrigation quotas(W1:2 250 m3/hm2,W2:2 700 m3/hm2)and three fulvic acid application levels(H0:0,H1:45.0 kg/hm2,H2:67.5 kg/hm2)were set,with a total of six treatments.The effects of fulvic acid application on the growth and development characteris-tics,dry matter accumulation,water and nitrogen utilization efficiency,yield,and correlation of irriga-ted maize were studied.The results show that both high irrigation quotas(W2)and the application of fulvic acid can increase the accumulation of maize dry matter and its formation rate.Under W2 treat-ment,the application of fulvic acid can significantly increase the plant height,stem diameter,and leaf area index of maize at maturity,while under W1 treatment,the improvement of the leaf area index is significant.High irrigation quota treatment has the characteristics of a long-duration of the rapid growth period and a high growth rate,which is conducive to the accumulation of dry matter in maize.Under different irrigation quotas,maize yield increases with the increase in fulvic acid application amount.By taking all indicators into consideration,the W2H1 treatment is recommended as the optimal water and fulvic acid application management mode for maize in the study area.The research results provide a theoretical basis and technical reference for water-saving and yield-increasing planting methods of maize in sandy loam soil areas,which has important application value.
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