Key points of Management of Maize entering jointing stage in Summer in July

At present, in July, corn has entered the jointing stage, which coincides with the peak period of water and fertilizer demand, and it is also the key period to increase maize yield. The main points of corn management in July are summarized as follows:

Corn

First, topdressing at the right time

Topdressing of corn, mainly nitrogen fertilizer, once topdressing, concentrated in the big trumpet stage of corn, topdressing 25kg urea per mu of corn, adding 5kg potassium dihydrogen phosphate, could enhance the lodging resistance of maize plants. When fertilizing, the chemical fertilizer is far away from the root of corn, applied in the middle of two rows of corn, and then covered with soil to reduce the loss of fertilizer effect.

Second, ploughing and weeding

Corn likes ploughing. Reasonable ploughing can not only effectively remove weeds, but also increase soil temperature and promote plant growth. Ploughing in drought can destroy the surface capillaries, prevent the evaporation of water under the surface, prevent drought and preserve soil moisture; ploughing after rain, consolidated soil can be broken, accelerate water evaporation and prevent waterlogging. Summer ploughing, should not be too deep, 5cm is appropriate, so as not to hurt the root. For corn fields with more serious grass damage, chemical weeding, 200 ml of 20% paraquat per mu, 30 kg of water, directional spray weeding, spray head should be installed with protective cover, so as to prevent the liquid from drifting and harming corn leaves and surrounding crops.

III. Timely drainage and irrigation

During the period of big trumpet mouth of corn, the critical period of water demand, in case of drought, will have a serious impact on maize yield. where irrigation conditions are met, it should be watered in time to resist drought and prevent "sticking neck drought". The filling period of spring maize is long, and "autumn drought" also has an effect on maize yield. If the corn milking period encounters drought, it should also be watered in time to resist drought. Although corn is a high fertilizer and water crop, it is not resistant to waterlogging. If there is a large area of stagnant water in the field after rain, it should be drained in time to prevent premature senescence of rotten roots of corn from affecting its yield.

IV. Prevention and control of diseases and insect pests

The main diseases and insect pests of corn in July are corn borer, armyworm and corn leaf spot. Surveillance should be strengthened and timely measures should be taken to control them.