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首页> 外文期刊>Journal of New Seeds >Sensitivity of Mineral Concentration to Frost and Harvest Date in Silage Maize (Lea mays L.)
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Sensitivity of Mineral Concentration to Frost and Harvest Date in Silage Maize (Lea mays L.)

机译：青贮玉米（Lea mays L.）中矿物质浓度对霜冻和收获日期的敏感性

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摘要

Decline in dry matter (DM) yield and quality of silage maize (Zea mays L.) after a killing frost has been reported, but information on the influence of frost on mineral concentration is lacking. The objective was to determine the influence of delayingharvest after frost on the concentrations of P, K, Ca, Mg, Cu, Zn, and ratios of Ca/P and K/(Ca + Mg). A maize hybrid (Pioneer~(R) 39NO3) was seeded under plastic mulch in late May of 2000, 2001, and 2002 at three locations. The crop was harvested fivetimes at approximately 10-day intervals. Two of the harvest dates were before and three were after the occurrence of a killing frost. The crop reached the 50% kernel milk line at first frost and considered suitable for harvest as silage. Following frost,there was a decline in the levels of these nutrients contained in the harvested crop. The highest losses between frost and the last harvest date were observed for K, Ca, and Mg in which an average of 4,4,2,7, and 1.8 g kg~(-1) were lost, respectively Among the sources of variation, harvest date had the strongest influence on mineral concentrations of maize harvested after frost. The results indicate that long delays in harvest after frost caused a decline in mineral concentrations and the nutritional value of silage made from frozen maize.
机译：据报道，杀灭霜冻后干物质（DM）产量和青贮玉米（Zea mays L.）的质量下降，但缺乏有关霜冻对矿物质浓度影响的信息。目的是确定霜冻后延迟收获对P，K，Ca，Mg，Cu，Zn的浓度以及Ca / P和K /（Ca + Mg）的比率的影响。 2000年5月下旬，2001年和2002年5月下旬，在三个地方播种了玉米杂交种（Pioneer？39NO3）。以大约10天的间隔五次收获农作物。其中有两个收获日期是在杀灭霜冻之前，三个是在杀死霜冻之后。初霜时，农作物的籽粒达到了50％的籽粒，认为适合作为青贮饲料收获。霜冻后，收割的农作物中这些营养素的含量下降。钾，钙和镁在霜冻和最后收获日期之间的损失最高，平均损失分别为4,4,2,7和1.8 g kg〜（-1）。 ，收获日期对霜冻后收获的玉米矿物质浓度影响最大。结果表明，霜冻后长时间的收割延误导致矿物质浓度下降以及冷冻玉米制成的青贮饲料的营养价值下降。

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