Combined zinc and nitrogen applications at panicle initiation for zinc biofortification in rice

Pub Date : 2019-09-16 DOI:10.18054/pb.v120i2-3.6866

Shah Hussain

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引用次数: 6

Abstract

Background and purpose: Increasing zinc (Zn) concentration in rice grains can help improve Zn nutrition of people. The combinations of Zn and nitrogen (N) applications at panicle initiation were investigated for Zn biofortification in rice. Materials and methods: Rice (cv. Super Basmati) seedling were grown in pots having a calcareous soil. All possible combinations of four Zn (control, Soil 6 mg Zn kg–1, foliar 2 × 0.2% Zn and soil + foliar Zn) and three N (control, soil 20 mg N kg–1 and foliar 0.5% N) levels were imposed at panicle initiation. At maturity, grains were analysed for Zn and proteins. Results: Grain protein concentration was significantly increased with foliar Zn treatments, and with soil and foliar N. Maximum grain Zn concertation (30 mg kg–1) was achieved with application of soil Zn + foliar Zn + foliar N. At each N level, Zn application by either method significantly increased grain Zn concentration over control. This increase in grain Zn concertation at N levels was 36 to 54% with soil Zn + foliar Zn, 27 to 45% with foliar Zn and 9 to 15% with soil Zn over its control level. Conclusions: Grain Zn concentration was significantly increased with soil N when combined with soil Zn, and with foliar N when combined with foliar Zn treatments. Conclusively, foliar N combined with soil + foliar Zn is the best combination of late Zn and N application for agronomic Zn biofortification in rice.

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水稻穗期锌氮复合施用对锌生物强化作用的研究

背景与目的：提高稻米中锌的含量有助于改善人体锌营养状况。研究了水稻穗期施用锌和氮的组合对锌生物强化的影响。材料和方法：在石灰性土壤中培育水稻幼苗。四种锌（对照，土壤6 mg Zn kg–1，叶面2×0.2%锌和土壤+叶面锌）和三种氮（对照，土地20 mg N kg–1和叶面0.5%N）水平的所有可能组合都在穗期施用。成熟时，对谷物进行锌和蛋白质分析。结果：叶面锌处理显著提高了籽粒蛋白质浓度，土壤和叶面氮也显著提高了蛋白质浓度。施用土壤锌+叶面锌+叶面氮可使籽粒锌浓度达到最大值（30 mg kg–1）。在氮水平下，土壤锌+叶面锌的籽粒锌含量比对照水平增加了36%至54%，叶面锌增加了27%至45%，土壤锌增加了9%至15%。结论：施用土壤锌时，籽粒锌浓度随土壤氮浓度的增加而显著增加，施用叶面锌时，粒锌浓度随叶面氮浓度的升高而显著增加。综上所述，叶面施氮与土壤+叶面施锌是水稻后期施锌和施氮的最佳组合。

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