CAJ | 학술논문

[目的]探讨氯醋树脂型缓释氮肥的养分释放特征及对土壤矿质氮的影响。[方法]以氯醋树脂和羟基改性的氯醋树脂为新型包膜材料制备包膜缓释氮肥，用水浸泡法来评价氯醋树脂型缓释氮肥的养分释放特征和用盆栽试验法研究氯醋树脂型缓释氮肥对土壤矿质氮的影响。[结果]氯醋树脂缓释氮肥的释放期为60 d，羟基改性的氯醋树脂缓释氮肥为50 d，氯醋树脂和羟基改性的氯醋树脂缓释氮肥处理的土壤铵态氮含量在30 d时达到了最高峰，土壤硝态氮含量在60 d时达到了最高峰，氯醋树脂缓释氮肥处理的土壤硝态氮含量在120 d时出现一次上升。在小麦产量上，各处理间无显著差异，但在后期的水稻产量上，氯醋树脂缓释氮肥显著高于羟基改性氯醋树脂缓释氮肥处理（P＜0.05）。[结论]盆栽试验法与水浸泡法评价缓释氮肥的释放天数是不同的，一季旱田作物并不能发挥缓释氮肥的肥效长的特点，需要做两季的水旱轮作，才能真正的发挥它的作用。
[목적]탐토록작수지형완석담비적양분석방특정급대토양광질담적영향。[방법]이록작수지화간기개성적록작수지위신형포막재료제비포막완석담비，용수침포법래평개록작수지형완석담비적양분석방특정화용분재시험법연구록작수지형완석담비대토양광질담적영향。[결과]록작수지완석담비적석방기위60 d，간기개성적록작수지완석담비위50 d，록작수지화간기개성적록작수지완석담비처리적토양안태담함량재30 d시체도료최고봉，토양초태담함량재60 d시체도료최고봉，록작수지완석담비처리적토양초태담함량재120 d시출현일차상승。재소맥산량상，각처리간무현저차이，단재후기적수도산량상，록작수지완석담비현저고우간기개성록작수지완석담비처리（P＜0.05）。[결론]분재시험법여수침포법평개완석담비적석방천수시불동적，일계한전작물병불능발휘완석담비적비효장적특점，수요주량계적수한륜작，재능진정적발휘타적작용。
Objective] The aim was to explore release characteristics of vinyl chlo-ride-vinyl acetate copolymer control ed-release N fertilizer and the effects on mineral nitrogen in soils. [Method] Vinyl chloride-vinyl acetate copolymer and hydroxyl-modi-fied VC/VAc were taken as coating materials to prepare slow release fertilizer. Nutri-ent release characteristics of VC/VAc slow release fertilizer was evaluated by water immersion method and the effects of VC/VAc slow release fertilizer on mineral ni-trogen were researched by pot experiment. [Result] The release periods of VC-VAc control ed-release urea and hydroxyl-modified VC/VAc coated urea were 60 and 50 d, respectively. Furthermore, the content of ammonium nitrogen reached the peak on the 30th d and the content of nitrate nitrogen reached the peak on the 60th d in soils in treatments with VC/VAc and hydroxyl-modified VC/VAc; the content of nitrate nitrogen rose again on the 120th d in the treatment with VC/VAc. In terms of wheat yield, different treatments showed insignificant differences and rice yield in the treatment with VC/VAc was significantly higher than that in the treatment with hy-droxyl-modified VC/VAc (P<0.05). [Conclusion] The release days of slow control ed-release fertilizer vary upon pot experiment method and water immersion method. Slow control ed-release fertilizer is not suitable for monoculture, due to long fertilizer efficiency, but multiple cropping would be optimal for its role to be ful y exploited.