The flowering period refers to the stage of corn from pumping to maturity. During this period, the vegetative growth was almost completed, and the vegetative growth and reproductive growth in the panicle stage progressed to the reproductive growth period centering on flowering loose powder and fertilization. It was a crucial period for the formation of yield and the determination of grain number per panicle and grain weight. The main objective of this period of management is to raise the roots and protect the leaves, prevent premature aging and greediness, extend the functional period of the green leaves, prevent grain abortion, and increase the seed setting rate and grain weight. The main technical measures for field management are:

1. Apply “Granule Fertilizer” as appropriate. High-yield practice has proved that the large leaf area, high photosynthetic efficiency, and long leaf functional period in the late growth stage of corn are the basic guarantee for achieving high yield. One of the important guarantees for the maturation of live green stalks of corn is that there is sufficient inorganic nutrition during the flowering period. Therefore, attacking grain fertilizers should be pursued as appropriate. The so-called discretionary application is to depend on the appearance of Daejeon plants. In the panicle fertilizer is sufficient, the plant looks good, the leaves dark green color, no early recession phenomenon of the field, you can not apply, so as not to prolong the growth period; if the panicle fertilizer is insufficient The phenomenon of defertilization of plants should be supplemented with grain fertilizer. The attacking granule fertilizer is generally applied before and after the flowering period of the female ear, combined with watering, 5 kg of urea or 10 to 15 kg of ammonium bicarbonate in the Mushi, deep in the hole. The high-yielding summer maize needs a large amount of fertilizer at the later stage of its growth, and it can also be quickly replenished with the foliar dressing method for the plots that lack fertilizer during the filling period. During the grouting period, 1%~2% urea solution, 3%~5% superphosphate extraction solution or 0.1%~0.2% potassium dihydrogen phosphate solution was sprayed on the foliage.

2. Timely emasculation can reduce nutrient consumption, promote nutrient delivery to the female ear, increase light intensity, increase light energy utilization, reduce plant height, and enhance lodging resistance. At the same time, emasculation can also part corn borer and aphid. Take out of the field, reduce damage, promote grain development, increase grain number and grain weight, generally increase production by about 10%. The emasculation was performed immediately before the tassels were removed without loosening the powder. It was easy to bring out the leaves prematurely and reduce the photosynthetic area. The tassels had blossomed loose powder and the detasseling effect was reduced. The emasculation should be performed with emasculation or septal castration. The number of emasculated plants should not exceed half of the total number of plants in the field. The head must not be emasculated. Even the rainy days and the high-temperature and dry weather are not emasculated so as to prevent pollen deficiency and affect the pollination and cause rarity. Sharp and pointed.

3. Artificially-assisted pollination Artificially-assisted pollination can ensure normal pollination and fertilization, increase seed setting rate, reduce baldness, and promote uniformity of grain size. Auxiliary pollination is more effective for plants with late drawing and large-scale, weak-strained plots. Artificial pollination is generally at the end of the flowering period. Select sunny days from 9 to 11 o'clock in the morning. Collect pollen and pollinate at the side, continue 2 or 3 times, and pay attention to alien pollination.

4. Timely watering and draining of popcorn The grain period is the critical period of water demand. During this period, the corn water consumption accounts for about 50% of the total water consumption, and the suitable soil moisture content is 70%~80% of the maximum water holding capacity in the field. The key water should be filled two times in the corn grain phase: the first time from flowering to grain formation, it is the key water to promote grain number; the second time in the milk period, it is the key water to increase grain weight. Sprinkler irrigation should be done differently, and be flexible. Sandy loam soil and light loam soil should increase irrigation times; clay and loam soil can be timely and appropriate irrigation; population size should increase irrigation times and irrigation volume. In addition, if there is too much rain in the corn grain period, attention should be paid to timely drainage.

5. The removal of a certain number of plants in the empty stalks of the maize field results in the formation of empty stalks or low-yield plants that do not produce spikes. They not only consume nutrients and water in vain, but also affect the photosynthesis of other plants, and therefore, pollination. After the end, the empty stalks and low-sludge plants should be removed early, and the limited nutrients and water should be supplied to the normal plants in order to make the panicles large and full.

6. Shallow cultivating and weeding In the late stage of corn filling, the plant ran straight and shallow once to remove the soil compaction, breathe loose soil, ensure weeding, promote soil nutrient conversion and root absorption, prevent premature aging, and increase grain weight. Shallow to prevent excessive rooting and break the leaves.

7. Prevention and control of diseases and insect pests The main diseases and pests of summer corn in the grain stage are corn borer, armyworm, cotton bollworm, aphid, size spot disease, and rust. Corn silkworms use 50% of dichlorvos 600 to 800 times the base of the filaments when the silkworm strain rate reaches 20%. In the middle and late period of grouting, if corn pods are drilled into the ears, use 50% dichlorvos EC or 50% phoxim EC 800 to 1000 times, 10 ml per plant, perfuse the corn ear. Foliar spray 50% phoxim 1500 times to control armyworm, cotton bollworm, 40% omethoate 1500 ~ 2000 times liquid control aphids. Corn leaf spot was sprayed with 50% carbendazim or 70% thiophanate-methyl wettable powder 500 times spray. Corn rust can be used to control 20% of Trichlorfon EC 75 to 100 ml/50 kg of water per mu.

8. Timely harvest of mature external long-term characteristics of corn is that the temporal lobe is loose in color, the seeds become hard, and the cortex is bright. A black layer appears at the intersection of the grain and the cob, indicating that corn has entered the ripening stage and the corn can be harvested. If the green leaves are very good and the growing season allows, it can be postponed for another 5-7 days to increase the yield.

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