Appropriate topdressing for promoting big spikes in middle and late summer corn
Maize plants from the jointing booting to the heading and flowering period, the fast growth rate, absorption of nutrients, is the key period of sucking fertilizer; after flowering and pollination, the absorption of nutrients, but the slow absorption rate. In terms of corn, the amount of nitrogen uptake in the seedling stage accounted for 9.7% of the total, 78.4% in the middle period, and 11.9% in the later period. Therefore, the high yield of summer corn must be applied in the middle and late stages of fertilization, early ear spikes, and high yields.
Apply fertilizer for jointing. It is the optimum period for the application of jointing fertilizer in the full-leaf and seven-leaf stage of summer maize. At this time, a large number of maize leaves are in full development. The period during which the stems are rapidly elongating requires a large amount of fertilizer, generally to the full leaf 9 leaf stage. At that time, soil nutrients could not meet the needs of corn growth. At this time, we should seize the point fertilizer before and after the jointing stage of the 7-9 leaf stage of the maize, apply the appropriate late planting and sparsely applied planting, and apply early and heavy planting to the thin plantlets, generally applying 15-20 kg of ammonium bicarbonate per acre. Manure 500-750 kg.
Foot water booting. The booting period is the period when most water is needed. In general, the water requirement for plant growth at the booting stage of maize accounts for 27%-38% of the total water requirement for the whole growing period. During this period, the soil moisture should be maintained at 70%-75% of the field water holding capacity. Fertilize with water to meet the needs of corn for growth and development.
Heavy ear fertilizer. Topdressing panicle fertilizer can not only improve the efficiency of photosynthesis, promote the growth of the leaves of the panicle and several leaves above and below, but also can prolong the life of the leaves and promote the fullness of the grain. The application time of panicle fertilizer is related to the corn variety and soil fertility. In general, early-maturing varieties range from 15-16 visible leaves or 8-10 unfolded leaves; medium-late-maturing varieties are suitable for 15-17 visible leaves or 11-12 unfolded leaves, with adequate basal fertilizer and vigorous growth. The plot can be applied with late panicle fertilizer. It is advisable to use a small number of plants in the whole field to start tasseling; the lean growth potential of basal deficiencies is poor, and panicle fertilizer should be applied early. Panicle fertilizer should use fast-acting nitrogen fertilizer, usually applying 25-35 kg of ammonium per acre or applying urea 7.5-10 kg.
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