Nutrient Release Characteristics of Vinyl Chloride-vinyl Acetate Copolymers Coated Slow-release Nitrogen Fertilizer and Its Effect on Wheat-rice Yield

doi:10.11924/j.issn.1000-6850.casb16060002

Abstract

Abstract: In order to study nutrient release characteristics of self-made material (Vinyl chloride-vinyl acetate copolymer) coated nitrogen fertilizer and its effect on wheat-rice yield, the slow-released patterns of the two kinds of coated nitrogen fertilizers (Vinyl chloride-vinyl acetate copolymer and hydroxyl-modified, VC/VAC) were analyzed through immersion. At the same time, the effects of coated fertilizers on the yield of wheat-rice were studied through pot culture experiments. It was found that the release period of VC/VAC coated ureas was 60 d, and the release period of hydroxyl-modified VC/VAC was 50 d. For VC/VAC and hydroxyl-modified VC/ VAC coated nitrogen fertilizers treatments, the ammonium nitrogen content in soil reached the highest peak at 30 d, while the nitrate nitrogen content in soil reached the highest peak at 60 d. There was no difference between VC/VAC and hydroxyl- modified VC/VAC coated nitrogen fertilizers treatments in wheat yield. However, VC/VAC nitrogen fertilizers treatment had significantly higher rice yield than hydroxyl-modified VC/ VAC coated nitrogen fertilizers treatment at later period (P＜0.05). The reason was that VC/VAC coated nitrogen fertilizers had better surface smoothness and uniformity, longer nutrient release period than that of hydroxyl- modified VC/VAC coated nitrogen fertilizers. So VC/VAC coated nitrogen fertilizers got higher nitrogen utilization efficiency and yield. This study illustrated the release rule of VC/VACs coated slow release nitrogen fertilizer, VC/VAC nitrogen fertilizers had higher rice yield than hydroxyl-modified VC/VAC under paddy upland rotation, and it had a certain guiding significance for the development and application of VC/ VAC coated slow release nitrogen fertilizer.

CLC Number:

S143. 7
S531

References

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