Abstract:

The content of zinc, iron and magnesium in brown rice and milled rice of 45 indica rice varieties were compared in this study. At the same time, a field trial was conducted to study the effects of spraying zinc fertilizer on Zn content of 9 indica rice, with three treatments（CK, spraying water; T1, zinc fertilizer; T2, zinc fertilizer+triadimefon）. The results showed that the contents of zinc, iron and manganese in brown rice of 45 rice varieties were 17.44 mg/kg, 10.99 mg/kg and 25.09 mg/kg, respectively; the contents of zinc, iron and manganese in milled rice of 45 rice varieties were 11.39 mg/kg、4.14 mg/kg and 7.38 mg/kg, respectively. The contents of zinc, iron and manganese in brown rice was 1.53 times, 2.56 times and 3.40 times as much as those in milled rice, respectively, the loss rates were 34.69%, 62.33% and 70.59% in the process of milling, respectively. The field experiment showed that zinc fertilizer was beneficial to improve grain yield and the zinc content of rice. T1 and T2 treatment increased the content of Zn in milled rice from 10.57 mg/kg of CK to 14.08 mg/kg and 14.79 mg/kg with an increase of 33.2% and 40.0%, and increased the content of Zn in brown rice from 17.63 mg/kg of CK to 22.1 4 mg/kg and 21.50 mg/kg with an increase of 25.6% and 22.0%, respectively. The combination of foliar zinc fertilizer and pesticide could not only significantly increase the zinc content of rice, but also effectively prevent diseases and insect pests. Therefore, the technique of spraying zinc fertilizer with pesticides is a high yield and high efficiency technique.

Key words: indica rice, genotype, Zinc fertilizer, application of foliage fertilizer, Zn nutrient, Hanzhong area

摘要：

分析了参加汉中地区水稻新品种展示的45个籼稻糙米、精米中锌、铁、锰含量的基因型差异。同时进行田间喷施试验，设置喷蒸馏水（CK）、喷Zn、喷Zn+井酮三环唑3个处理，探讨了锌肥与井酮三环唑配施对水稻锌营养品质的影响。结果表明，45个水稻品种糙米中锌、铁、锰的平均含量分别为17.44 mg/kg、10.99 mg/kg和25.09 mg/kg，精米中锌、铁、锰的平均含量分别为11.39 mg/kg、4.14 mg/kg和7.38 mg/kg；糙米中锌、铁、锰含量分别是精米中的1.53倍、2.56倍和3.40倍，即在去糙过程中锌、铁、锰的损失率分别为34.69％、62.33％和70.59％；喷施锌肥有利于水稻产量的提高，同时增加籽粒锌含量。喷Zn、喷Zn+井酮三环唑处理使糙米Zn含量由CK的17.63 mg/kg分别提高到22.14 mg/kg和21.50 mg/kg，增幅分别为25.6%和22.0%，精米Zn含量由CK的10.57 mg/kg分别提高到14.08 mg/kg和14.79 mg/kg，增幅分别为33.2%和40.0%。水稻喷施叶面锌肥与农药后不仅能显著增加稻米锌含量，而且有效预防病虫害。因此，喷施锌肥与喷施农药有机结合有望成为缺锌土壤同时满足籽粒富锌和病虫害防治需求的高效农艺措施。

关键词: 籼稻, 基因型, 锌肥, 喷施叶面肥, 锌营养, 汉中地区