Function and mechanism of bio- humic acid for chemical fertilizers reduction

In order to explore the effect and mechanism of bio-humic acid reduce the amount of chemical fertilizers, the amount and ratio of chemical fertilizers and bio- humic acid were adjusted for60 d rape planting by pot experiment, yield, quality of rape and soil characteristics were analyzed. The results showed that, 3 Fertilizer applicaiton can increase the yield of rapeseed, significantly; 3 Compared to 60% amount chemical fertilizer, 100% chemical fertilizer and chemical fertilizers mix bio-humic acid fertilizer increased rape production significantly, 60% of chemical fertilizers add bio-humic acid can significantly increase 60% yield; 3 Bio-humic acid application to rape could promote the absorption of N, P, K nutrients, improve fertilizer use efficiency. The mechanism may be, apart from provide nutrients,bio-humic acid also can maintain soil organic matter content and improve soil properties, directly; it also can regulate soil p H, activation of alkaline soil nutrients, improve soil microbial activity, indirectly. The results show that the effect of bio- humic acid application can reduce the amount of chemical fertilizer effect was obvious, the replacement of chemical fertilizers with bio- humic acid, and improvement of nutrient use efficiency were supported by our results.