Abstract:

A field experiment was conducted to study the application effects of wheat specific humic acid fertilizer (Triticum aestivum L.) and its reduction on wheat in fluvo-aquic soil area in north Henan, in order to clarify the potential of humic acid fertilizer reduction and provide theoretical support for fertilizer efficient and rational application. In the experiment, seven treatments were set up: T1 (the control, without fertilization), T2 (conventional fertilization), T3 (optimized fertilization, applying wheat specific common fertilizers), T4, T5, T6 and T7 (applying 100%, 90%, 80% and 70% wheat specific humic acid fertilizer respectively, and T4 and T3 had the same amount of nutrients). We investigated the differences of yield, and nutrient uptake and use efficiency of wheat, as well as the content of soil nutrients among different treatments. The results showed that under the same nutrient condition, compared with T3, the total nitrogen (N) and potassium (K) accumulation of wheat under T4 increased by 5.6% and 4.7% respectively. There was also obvious increase in phosphorus (P) content in wheat straw and grain at the mature stage, and the content of soil alkali-hydrolyzed N and available K at the wintering stage, but the yield did not increase. The yield of T5 was the highest, which was increased by 20.0%, 4.7%, 8.4%, 9.8%, 13.9% and 18.4% compared with that of T1, T2, T3, T4, T6 and T7; moreover, the fertilizer agronomy efficiency and fertilizer partial productivity of T5 were also the highest, which were 5.18 kg/kg and 31.07 kg/kg, respectively. There were significant decreases of the total nutrient accumulation of wheat, and soil alkali-hydrolyzed N content and available P content at the flowering stage under T6 and T7, and the yield and fertilizer agronomy efficiency of the two treatments were also lower than those of other fertilization treatments. Moreover, the content of soil available P and available K of T7 were also significantly reduced at the harvest stage. Under the conditions of this experiment, the application of 90% wheat specific humic acid fertilizer could reduce fertilizer amount and improve wheat yield to a certain extent in fluvo-aquic soil area in north Henan.

Key words: wheat specific humic acid fertilizer, reduction, wheat (Triticum aestivum L.), fluvo-aquic soil area, application effects