摘要
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。
High pH value and low effectiveness of available iron were the two factors inducing plant iron deficiency chlorosis in calcareous soil. EDTA-Fe had better effects on iron deficiency, but it was not popu-larized because of its high price and lower effectiveness in alkalify condition. According to the low cost and high utilization rate of bag - controlled released fertilizer, this experiment added EDTA - Fe and sulfamic acid to study its iron supplementation effects on peach seedlings. The results showed that the soil available iron concentration was steadier under bag - controlled release treatments than that under spread application treat-ments. The bag - controlled released fertilizer with sulfomic acid decreased the soil pH value and HCO3^- con- centration significantly, in which, the treatment with only sulfamic acid had the biggest drop, and then the B2 treatment with 12 g EDTA- Fe and 15 g sulfamic acid. The root-shoot ratio, SPAD, active Fe and total Fe contents of plants under the bag - controlled release treatments were obviously higher than those under the spread application treatments, and the effects of B2 treatment were the best.
出处
《山东农业科学》
2013年第9期70-74,78,共6页
Shandong Agricultural Sciences
基金
国家现代农业产业技术体系专项(CARS-31-3-03)资金资助
关键词
桃
EDTA-铁
氨基磺酸
袋控缓释
补铁
Peach
EDTA - Fe
Sulfamic acid
Bag - controlled release
Iron supplementation
