Effects Of Foliar Zinc Application On Zinc Accumulation And Quality Of Grains In Different Ear Parts In Wheat(Triticum Aestivum L.)

To improve the zinc nutritional quality of wheat and provide theoreticalbasis for high-yield, high-quality and high-efficiency cultivation, this study in theHuanghuai Plains widely cultivated half winter varieties of Aikang58andXi′nong979were used as material, studied the effect of the wheat growth anaphasespraying different concentration of zinc fertilizer on wheat yield and kernelweight,quality, focused on the accumulation rule of zinc in different stem tillers spikeand different spikelet grains, the main results were as follows:(1) Zinc accumulation in ears in different tiller positions Grain zinc contentbetween main-culm ears and ears in different tiller positions significantly increasedwith the spraying zinc fertilizer concentration improved. Grain zinc content ofmain-culm ears was higher at lower concentrations of zinc treatment, while at higherconcentration of zinc treatment, grain zinc content of ears in different tiller positionswas apparently higher than main-culm ears, so spraying zinc fertilizer was beneficialto improve the grain zinc content of tiller ear. Grain zinc content between main-culmor tiller ears was distinctly different after zinc application in different wheat cultivars.With the spraying concentration, the range of grain zinc content of Aikang58increased was less than Xi′nong979. Besides that, grain zinc content of main-culmand tiller ears of Aikang58was all lower than Xi′nong979in different concentration.(2) Zinc accumulation in grains in different ear parts Zinc content in grains bothof ears in different tiller positions and from different ear parts in wheat weresignificantly improved after spraying zinc fertilizer. With the spraying concentrationincreased, grain zinc content of different ear parts increased gradually. Grain zinccontent of the upper and lower ear parts was higher than the middle, and the effectwas more evidence with higher zinc concentration. But the reaction of different earparts of two wheat cultivars to zinc was different. At different concentrations of zinc,grain zinc content between main-culm ears and ears in different tiller positions in Aikang58were averagely higher48.9%and48.5%than the control, whileXi′nong979were averagely higher70.88%and80.85%.(3) The relationship of zinc accumulation with grain yield The effect on zincyield in grains both of ears in different tiller positions and from different ear parts wassignificant when spraying zinc fertilizer in the late stage of wheat. The zinc yield ofmain-culm and tiller ears increased7.12%~71.87%and14.07%~89.16%, and thedifference of grain content reached extremely significant with spraying differentconcentration. But grain yield were only increased by1.68%~10.5%, the resultshowed that the improvement of zinc mainly depended on the increase of grain zinccontent although there was a certain relationship with grain yield. Grain zinc contentamong the upper, middle, and lower ear parts of main-culm and tiller ears improvedwith spraying concentration of zinc, and the difference was extremely significantamong the all treatments.(4) The relationship of zinc accumulation with protein, soluble sugar, starch andratio of amylase to amylopectin It significantly improved the content of grainsoluble sugar, starch and ratio of amylase to amylopectin in wheat after spraying zincfertilizer in the late stage of wheat. But grain protein content wasn’t apparentdifference from contrast. The effect of zinc application on the two wheat cultivars wasdifferent. Aikang58′s grain protein, soluble sugar and starch achieved the highestwhen spraying concentration was2g·L-1, while Xi′nong979′s when was4g·L-1.