Over the years, natural disasters have caused serious damage to maize breeding, especially in Shandong's Jiaodong region. The main manifestations are the drought, high temperature, and rainy weather during the four pollen mother cells to flowering. These disasters are intertwined. During the time, pollen is often unsufficient, and flowering, baldness, and abortion are common deaths. The production of various species is drastically reduced, and the serious plot yield is less than 20kg/667m2. Through practice, we have learned profoundly that only by knowing and mastering meteorological data and knowledge can we use synthetic new technologies to overcome natural disasters and capture high yields. 1 In order to grasp the agricultural time, one promotes it to the end. From the seedling stage to the completion of the trophic body, comprehensive technology is used to promote it. 1.1 Top-dressing watering Starting from the seedling stage, use 4 kinds of mixture of 20mg/kg 920, 0.2% potassium dihydrogen phosphate, 1,200 times phoxim, and 1.5% urea to infuse the parental leaves or spray on the leaves in the evening, every 7 days. 1 time, 3-5 times in a row. At the booting stage, combined with watering to recover carbon ammonia 50kg/667m2, and at the end of the big bell mouth, the parents were evenly sprayed on leaf 4 with 3000 times of ethephon to promote early maturation and increase production. 1.2 Prevention and control of pests during the seedling stage mainly control tigers, beetles and thrips; during the trumpet period, they mainly control corn borers, cotton bollworms, red spiders, etc., and simultaneously sprayed dexamethasone zinc or triadimefon, virus A to prevent various diseases; , A tortoiseshell, and aphids to protect filaments and pollen. 2 advance to male, cut the leaves, cut the filament 2.1 ahead of the male band with two parietal leaves to completely eradicate the male parent, ahead of the male to save both nutrients but also early pumping filaments, advance pollination conducive to high yield. 2.2 The cutting of loquat leaves should be carried out in the afternoon to facilitate the pollination the next day. Cut the leaves to extract filaments in advance. 2.3 Cut filaments and rubbing water In the event of high temperatures or rain (in mid-July), filaments and dew must be cut. Drops of pollen on the filaments are easily deceased due to dew; when the pollen is pollinated, the temperature in the field does not exceed 28°C within 3 hours and it can fully inseminate. Cut flowers in the afternoon, the next morning. Wipe off the filament dew with a dry towel. 3 Adjusting flowering period and artificial pollination 3.1 Flowering period adjustment When the flowering period forecast is unsatisfactory, it is possible to adjust one leaf difference by infusing the two mixed leaves of the above root dressing with the mixture of the above two roots. 3.2 Artificially assisted pollination During maternity pollination, every morning after wiping off the dew from the mother's filigree, a motorized sprayer (which must be cleaned and no pesticides are allowed) is used to spray the parent taro across the ridge.
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