(I) Meaning of timely harvest
The yield and quality of corn have a lot to do with harvesting. When grain does not reach physiological maturity, grouting continues and dry matter is still accumulating. Premature harvesting will inevitably reduce grain weight and yield. On the other hand, the harvest time is delayed and the yield is also lost, partly due to a decrease in the grain moisture content; because, when the grain matures, the dry matter accumulation decreases and relatively ceases, but the seed respiration continues and consumes some of the dry matter. substance. Due to the dizziness, timely harvesting can ensure maximum yield of corn.
(II) Indicators for timely harvest
1. Accumulated temperature indicators Each maize variety has a certain period of growth, and there are certain requirements for accumulated temperature. Only when the accumulated temperature fully meets the requirements can the grain production capacity be maximized. 2. Physiological indicators The morphological sign of corn physiological maturity is that the loquat leaves are completely yellow and loose, the seeds at the top of the ear are very smooth and smooth, and the “black layer†appears at the junction of the base and the cob of the grains in the middle of the ear, which proves the grouting. At the end of the process, the grain weight reaches its maximum value. 3. Time Index Generally, it takes about 50 days for corn to spine to mature. The spring sowing of corn is a bit shorter, and the sowing of corn in summer is longer. Therefore, the autumn harvest time can be arranged according to the spinning time.
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