The tillering period is the deciding period for the number of panicles per acre. If you want to obtain more panicles, the key lies in the early occurrence of the tiller and the fullness of the birth. Therefore, according to the growth rules of tillers, leaves, and root extension organs and their requirements for external environmental conditions, effective technical measures are taken for paddy fields of different varieties and fertility to ensure that the plants are strong and strive for multiple spikes. This is field management. The main direction of attack. That is to say, "promoting" is the main method in the early stage, and the number of effective twitches in the early stage is promoted. In the later stage of labor, the "control" mode should be used to control the occurrence of invalid cicadas and seal the line prematurely to increase the spike rate. Put forward the following key field management measures for reference:
1, early application sub-fertilizer. In order to ensure early delivery of childbirth, immediately after the return of green manure application. The amount of manure fertilizer accounts for 20-30% of the total fertilizer. Generally based on nitrogen fertilizer, urea can recover about 10 kilograms per mu. For fields with high soil fertility and good quality of seedlings, it is recommended to use less or no fertilizer. For late-inserted, low-fertility plots, coupled with high temperatures in recent days, the growth rate of seedlings is accelerated, and a large amount of fertilizer is required in the early stage of growth. Early fertilization is needed to promote early delivery and early-onset fast-onset emergence of seedlings as soon as possible.
2, water slurry management. When young seedlings were planted, the roots were injured and the water absorption capacity was reduced. However, the transpiration of the leaves did not decrease and the water balance was easily lost. At this time, a deep water layer of about 3 cm was kept to protect the seedlings. After returning green, shallow water ground irrigation was adopted to combine wet and shallow water, so that the base of the rice plant was well ventilated and light-transmitting, with the development of roots, and the capacity of sucking up fertilizer was enhanced, and the early growth of delivery was promoted.
When the number of tillers reaches 90% to 100% of the planned number of panicles, or if the field has already entered young panicle differentiation and jointing, the field shall be drained in time. The degree of the field shall be based on the growth of the seedlings, weather conditions, and soil properties. It was decided that lighter cropping and soft-seedling methods should be adopted, especially for those that were planted late this year. Invalid control of delivery, improve the rate of spikes, and create conditions for strong stalks and ears.
3, in addition to early. Usually about 7 days after the rice is planted (throwed), it should be removed for the first time. Weeds occur in heavier plots, with 50% faster killing per acre 40-50 grams (control madder) plus 10% benzalkonuron 15 grams (1 package half, control broadleaf weeds), add water spray. Pre-drainage of field water before the use of drugs, moist medication, shallow water after 1 day after application. Medium-term broad-leaved weeds can be controlled by low-toxic, high-efficiency herbicides such as herbicides.
4, control of pests and diseases. Can be combined with the turn of the Qing period, with a drug in late June, indicies such as Laodelphax striatellus, aphids, rice weevil and other pests, to reduce the population base. Imidacloprid plus acaricidal agents are generally available. They are sprayed with a mist sprayer, and the field is kept in shallow water.
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