Corn ear management is at the time

This year, corn is planted 2 to 3 days earlier than usual, and it enters the growth stage of the earing stage in early July. The ear stage refers to the growth and development period from jointing to tasseling. It is the fastest growing growth in corn, the largest growth, and the need for fertilizer. In the critical period of maximum water, the demand for NPK accounts for about 65%, 55% and 85% of the total growth period, and the water requirement accounts for about 30%. At the center of this stage, the center of the field management is to promote the strong stalks, large ears and large ears. It not only ensures the healthy growth of the vegetative bodies, but also ensures the development of the ear, and builds a high-yielding appearance with strong individual growth and moderate population growth. In order to capture this year's corn harvest, the key points of the current field management are as follows.

First, timely and appropriate amount of topdressing. The earing stage is the maximum efficiency period for corn to be fertilized. Therefore, all the plots that are arranged for topdressing or insufficient use of base fertilizer should be applied to corn ear fertilizer in time. Especially in the current conditions of straw returning to the field, the topdressing should be as early as possible, and the corn can be applied after the jointing. The amount of topdressing is determined according to the nitrogen application rate set by the target yield, and the general application of urea is about 15 kilograms to ensure the whole growth period. The amount of pure nitrogen can be 15 kilograms; artificial strips or mechanical strips can be used to cover the soil to prevent the loss of fertilizer, so as to benefit the fertilizer.

The second is timely drainage and irrigation. Although the water needs more water at the earing stage, the soil over-wet affects the growth of the corn roots and reduces the yield. Therefore, in case of waterlogging, the water should be drained in time to maintain the soil moisture in the field of 70%-80% of the maximum water holding capacity. Before and after the tasseling, the corn has already been out of the plum, and it is prone to high temperature and drought, which is prone to neck and drought, and is prone to pollen abortion caused by high temperature and drought. Therefore, once there is a drought before and after the tasseling, it is necessary to irrigate in time.

The third is the integrated prevention and control of pests and diseases. The pests at the earing stage mainly include corn borer. The second generation of corn borer began to occur in the middle and late July, which is the large trumpet period of most summer corn. In the ear stage, the corn borer mainly feeds on the leaves in the heart leaf (in the trumpet mouth), and feeds the female ear during the tasseling to the silking stage. After the corn begins to bear, the straw and the cob and the stalk are drilled. Therefore, the best period for controlling corn borer is the large bell mouth period, and it will be very difficult to carry out prevention after the tasseling. The control method of corn mash is to use spray treatment such as Kangkuan or tebufenozide; granules such as phoxim or Bt emulsion 100-150 ml plus fine sand 5 kg can be used to control corn in the heart leaves around July 20 Hey. The main diseases in the summer corn ear are brown spot disease and stem rot. Brown spot disease can be controlled by adding 20% ​​triadimefon to potassium folate and other foliar fertilizer sprays in 6-8 leaves of corn. Pay attention to the uniform spraying of the spray cap and the leaves.

The fourth is the remedy after lodging. The lodging before and after jointing generally does not require artificial lifting. Most of the corn that fell before the jointing was caused by excessive rainfall and was soaked in rain. Since the resilience is very strong at this time, it is only necessary to eliminate the accumulated water in the field. After lodging, the plants can naturally return to erect, without affecting the normal pollination and solidification in the future, allowing them to recover on their own. The corn plants that are lodging before and after pollination are tall, and the plants are stacked under each other, which is difficult to recover naturally. It will not only affect the photosynthesis, but also affect the normal growth and development, silking and pollination, and need artificial lifting. When lifting, it should be early, slow, light, and combined with soil fixing.

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