Technical measures for the Management of flowering and Grain stage of Summer Maize

The main goal of this period is to maintain roots and protect leaves, prevent premature senility and greed, prolong the functional period of green leaves, prevent grain abortion, and improve seed setting rate and grain weight.

One is the skillful application of grain fertilizer: the so-called skillful application should depend on the appearance of plants in the field. In fields with sufficient panicle fertilizer, good plant appearance, dark green leaves and no early decline, it may not be applied so as not to prolong the growth period. If the ear fertilizer is insufficient and the plant is de-fertilized, grain fertilizer should be applied. The principle of applying grain fertilizer is "sooner rather than later". General mu urea 5 kg or ammonium bicarbonate 10-15 kg, burrowing deep application. It can also be foliar sprayed with a mixture of 1%-2% urea and 0.4%-0.5% potassium dihydrogen phosphate, with a solution of 70kg / mu.

Second, irrigation and drainage: soil moisture should be kept at 70%-80% of the maximum field capacity in order to facilitate flowering and insemination. If the field capacity exceeds 80%, pay attention to drainage.

The third is interline emasculation: when the corn is just heading, one male ear is removed in one row or another, and the male is 1/2 in the whole field, which is conducive to ventilation and light in the field, save nutrients, reduce insect pests, and increase production by 5% and 8%. The way to emasculate is when the male ear pulls 1 / 3 or 1 / 2 from the apical leaf. Before dispersing powder, the male ear should be pulled out in time between rows or plants. It is best to remove the male flowers of the first male plants or weak plants, but do not remove the male flowers in a few lines on the ground, so as not to affect pollination, do not damage the top leaves when removing male, let alone cut off the stems and leaves above the ear, otherwise the yield will be reduced.