Slow release fertilizers are designed to enhance crop yield and minimizing the loss of nitrogen(N)to environment.However,N release in leaching and loss in ammonia emission from bag controlled release fertilizers have ...Slow release fertilizers are designed to enhance crop yield and minimizing the loss of nitrogen(N)to environment.However,N release in leaching and loss in ammonia emission from bag controlled release fertilizers have not been previously evaluated under the standardized conditions in soil.Accordingly,a laboratory study was conducted to evaluate the characteristics of N release from a bag controlled fertilizer with 1,3,5 and 7 rows of hole(B-1,B-3,B-5,B-7)and a kraft bag without hole(B-W).The results showed that the amount of N leaching of B-1,B-3,B-5,B-7 and B-W were significantly lower than urea fertilizer without bag(U).The maximum N release from the fertilizers followed the order:U(83.16%)>B-7(54.61%)>B-5(54.02%)>B-W(51.51%)>B-3(48.87%)>B-1(38.60%)during the experimentation.Compared with U treatment,ammonia volatilization losses were significantly decreased by B-1,B-3,B-5,B-7 and B-W treatments.Based on N release and loss,a suitable bag with holes should be considered in practice when using the bag controlled fertilizer to meet an environment good objective.The evaluation method merits further study combined with field experiment.展开更多
高pH值和土壤铁有效性低是石灰性土壤上诱发植株缺铁黄化的两大因素,作为近年来矫治植物缺铁效果较好的EDTA-铁,因其高价格及其在碱性环境下有效性低的特点而使其推广受到了限制。本试验结合袋控缓释肥成本低、肥料利用率高的特点,设计...高pH值和土壤铁有效性低是石灰性土壤上诱发植株缺铁黄化的两大因素,作为近年来矫治植物缺铁效果较好的EDTA-铁,因其高价格及其在碱性环境下有效性低的特点而使其推广受到了限制。本试验结合袋控缓释肥成本低、肥料利用率高的特点,设计了加入螯合铁和氨基磺酸的袋控缓释肥,以桃幼苗为试材,对其补铁效果进行研究。结果表明,肥料袋控缓释处理在植株生长季中土壤有效铁浓度稳定,而肥料撒施处理土壤有效铁浓度波动大;同时,加入氨基磺酸的袋控缓释处理显著降低了土壤pH值和HCO-3浓度,其中只加入氨基磺酸的袋控缓释处理降低幅度最大,其次是B2处理(袋控缓释肥的肥芯是12 g EDTA-铁和15 g氨基磺酸);袋控缓释处理植株的根冠比、叶绿素含量、活性铁及其全铁含量高于撒施处理,其中B2处理最佳。展开更多
基金The present work was financially supported by National Key R&D Program(2018YFD0600104)Scientific Program of Zhejiang Province of China(2017C02016).
文摘Slow release fertilizers are designed to enhance crop yield and minimizing the loss of nitrogen(N)to environment.However,N release in leaching and loss in ammonia emission from bag controlled release fertilizers have not been previously evaluated under the standardized conditions in soil.Accordingly,a laboratory study was conducted to evaluate the characteristics of N release from a bag controlled fertilizer with 1,3,5 and 7 rows of hole(B-1,B-3,B-5,B-7)and a kraft bag without hole(B-W).The results showed that the amount of N leaching of B-1,B-3,B-5,B-7 and B-W were significantly lower than urea fertilizer without bag(U).The maximum N release from the fertilizers followed the order:U(83.16%)>B-7(54.61%)>B-5(54.02%)>B-W(51.51%)>B-3(48.87%)>B-1(38.60%)during the experimentation.Compared with U treatment,ammonia volatilization losses were significantly decreased by B-1,B-3,B-5,B-7 and B-W treatments.Based on N release and loss,a suitable bag with holes should be considered in practice when using the bag controlled fertilizer to meet an environment good objective.The evaluation method merits further study combined with field experiment.
文摘高pH值和土壤铁有效性低是石灰性土壤上诱发植株缺铁黄化的两大因素,作为近年来矫治植物缺铁效果较好的EDTA-铁,因其高价格及其在碱性环境下有效性低的特点而使其推广受到了限制。本试验结合袋控缓释肥成本低、肥料利用率高的特点,设计了加入螯合铁和氨基磺酸的袋控缓释肥,以桃幼苗为试材,对其补铁效果进行研究。结果表明,肥料袋控缓释处理在植株生长季中土壤有效铁浓度稳定,而肥料撒施处理土壤有效铁浓度波动大;同时,加入氨基磺酸的袋控缓释处理显著降低了土壤pH值和HCO-3浓度,其中只加入氨基磺酸的袋控缓释处理降低幅度最大,其次是B2处理(袋控缓释肥的肥芯是12 g EDTA-铁和15 g氨基磺酸);袋控缓释处理植株的根冠比、叶绿素含量、活性铁及其全铁含量高于撒施处理,其中B2处理最佳。
