中国生态农业学报2011，Vol.19Issue(6)：1243-1249,7.DOI:10.3724/SP.J.1011.2011.01243
磷锌肥配施对冬小麦籽粒锌生物有效性的影响
Effect of Zn and P supply on grain Zn bioavailability in wheat
摘要
Abstract
Phytic acid is not only the richest form of P, but also a main element reducing zinc bioavailability in wheat grains. A field experiment was conducted in a split-split design with 4 wheat genotypes ("Zhongyu 6", "Xiaoyan 22", "Xizal" and "Zhengmai 9023") of varied zinc efficiency. The experiment investigated the interactions of P, Zn and phytic acid in wheat, and the effects of P and Zn fertilization on Zn bioavailability in wheat grains. Two rates of zinc [0 kg(Zn)hnf-2 and 7 kg(Zn)·hm-2] and five rates of P [0 kg(P2O5)·hm-2 (deficient), 50 kg(P2O5)·hm-2 (low), 100 kg(P2O5)·hm-2 (suitable), 150 kg(P2O5)·hm-2 (high) and 200 ' kg(P2O5)·hm-2 (excess)] were designed. The results showed that Zn application obviously increased soil available Zn content. Even after wheat cultivation, soil available Zn content under Zn treatment was higher than that under no Zn treatment. Meanwhile, P concentration, P/Zn ratio, phytic acid concentration and phytic acid/Zn2+ molecular ratio in wheat grains slightly dropped by 0.5%, 1.85%, 2.7% and 6.2%, respectively. Zinc bioavailability increased slightly because of Zn application. Also phytic acid concentration and phytic acid/Zn2+ molecular ratio dramatically increased with P treatment. For instance, increasing P treatment from 0 to 100 kg·hm-2 increased phytic acid concentration and phytic acid/Zn2+ molecular ratio by 13.4% and 25.94% respectively, while decreasing zinc bioavailability in wheat grain. Similarly, wheat grain phytic acid concentration and phytic acid/Zn2+ molecular ratio increased at low P treatment and decreased at high P treatment, and peaked at 100 kg·hm-2 and 150 kg·hm-2 P treatment with values of 5.02 mg·g-1 and 11.56 respectively. Excessive P treatment decreased phytic acid concentration in wheat grain. Furthermore, wheat grain phytic acid/Zn2+ molecular ratio under suitable (100 kg·hm-2) P treatment was similar to that under low (50 kg·hm-2) P treatment, but lower than that under high (150 kg·hm-2) P treatment. Hence suitable P treatment was considered a better measure for zinc nutrition in wheat grain. It was concluded that zinc bioavailability in wheat grain could increase under suitable combinations of Znand P treatment. P treatment was noted to be more important than Zn treatment.关键词
植酸/磷锌比/锌肥/磷肥/锌生物有效性/小麦籽粒Key words
Phyitc acid/ P/Zn ratio/ Zinc fertilizer/ Phosphorus fertilizer/ Zinc bioavailability/ Wheat grain分类
农业科学引用本文复制引用
买文选,田霄鸿,陆欣春,杨习文..磷锌肥配施对冬小麦籽粒锌生物有效性的影响[J].中国生态农业学报,2011,19(6):1243-1249,7.基金项目
国家自然科学基金面上项目(31071863,40971179)和教育部新世纪优秀人才支持计划(NCET-06-0866)资助 （31071863,40971179）
