At present, summer corn has entered the filling stage. During this period, the main goal is to ensure the good grain filling of corn, which provides a basic guarantee for the harvest and harvest. But at the same time pay attention to field management, to prevent production cuts, and corn maturity is late, hindering harvest.

I. Water and fertilizer management

1. Applying nitrogen fertilizer

After the earing of corn, the fertilizer applied in most plots has been basically exhausted. In order to ensure the filling and grain fullness, it is necessary to supply quick-acting nitrogen fertilizer to prevent premature aging of corn and increase 1000-grain weight. According to the local actual situation, according to the fertilizer situation during the growth period, 50 kg of ammonium bicarbonate or 16-20 kg of urea can be applied per mu.

2. Appropriate application of trace element fertilizer

In the growth and development of corn, not only the supply of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer is needed, but also the micro-element fertilizer is needed to increase efficiency. For example, boron promotes the transport of photosynthesis products to seeds, increasing the 1000-grain weight.

3. Taboo big water big fat

Watering and topdressing in corn filling period increases the yield, which is the key to ensuring a bumper harvest. However, it must not be invested too much, otherwise it will easily lead to late maturity of corn and affect production.

Second, strengthen field management

Cultivating soil

Lodging in the middle and late stages of corn is the main factor limiting corn yield increase. In the late filling stage, shallow cultivating should be carried out once, the soil should be ventilated, weeding and weeding to prevent grass damage , and it is also conducive to nutrient decomposition, promote root absorption, prevent premature senescence of leaves, and increase yield. In addition, cultivating the soil is also conducive to the lodging resistance of the corn. In July and August, storms often occur, causing the corn to fall. Therefore, it should be noted that the height of the soil is 7-8 cm, which promotes the development of the roots, increases the number of supporting root layers, prevents lodging, Conducive to irrigation and drainage, burying weeds and increasing production.

2. Interlaced

It is an important measure to increase the yield by increasing the cross-pollination rate and increasing the yield by about 5% to 10%. The emasculation should be extracted and thrown out of the field when the ceiling is pulled out about 1/3 to 1/2. Generally, the emasculation of the detached plants is better than that of the detached ostriches. Because the stagnation of the stalks makes the males and stalks of the males and stalks are not male, increasing the chance of pollination; in addition, the plants at the edge of the fields are not to be emasculated, so as not to affect the pollination.

3. Quantian to Xiongxiong

The male flowers of the corn are scattered with pollen. After 15 days, the pollen is scattered. Then the male flowers should be removed from the stalks and thrown into the fields to reduce resource competition.

4. Remove the empty stalk

Due to the variety characteristics or the seedlings are too dense, some corn grows 1 to 2 tillers in the rhizosphere, and there are no sticks. These empty stalks and tillers should be removed, improve the ventilation and light transmission conditions in the field, reduce fertilizer consumption, and help the plants to be normal. Growth and development, promote the formation of large spikes and large grains.

5. Make the most of the sun

The main target of the filling period is to preserve roots, preserve leaves, prevent premature senescence of leaves, and promote the corn kernels and grain weight to obtain high yield. Appropriate late harvesting of corn is a simple and easy to increase production technology without increasing costs.

6. Timely prevention and control of pests and diseases

The main pests and diseases in corn filling stage include small spot disease, Curvularia leaf spot, brown spot, rust, three generations of corn borer, aphids and armyworms. Curvularia leaf spot disease is controlled by oxazolol or tebuconazole spray; brown spot and rust can be sprayed with 25% triazolone wettable powder; third generation corn borer with 5% emamectin·benzoic acid The salt is sprayed with 6 grams per acre to the ear and leaf back; the aphid is sprayed with 70% imidacloprid 10 to 20 grams per acre; the armyworm is controlled with pyrethroids and carbamate insecticides .

7. Timely harvest

Only when harvested in time can we harvest a good harvest. Harvest at the right time, generally when the corn leaf is dry and loose, the grain becomes hard and shiny, the milk line disappears, and the black layer appears at the base, which is the ripening period. The general variety should be around September 25, that is, 45-50 days after maturity. To achieve the standard. At this time, the harvest yield is highest.

If the corn is harvested too early, it will seriously affect the increase of yield and quality. Therefore, if the production does not affect the wheat, it should be collected as late as possible, and the filling time should be extended. The harvest time is delayed by one day, and the 1000-grain weight is increased by 2 to 3 grams per day. The average daily increase is 5-6 kg/mu. Therefore, the corn harvest period should be postponed as much as possible without affecting the normal sowing of the lower glutinous wheat. The technology does not increase any cost input, and increases the 1000-grain weight, and the corn yield and quality are significantly improved.

Lithium Tetrafluoroborate (LiBF4) is white or yellowish powder, easily soluble in water, carbonate solvent and ethers compounds. The melting point of LiBF4 is 293-300℃, with the relative density of 0.852g/cm3.LiBF4 has excellent chemical and thermal stability and is mainly used as an additive in LiPF6 based electrolyte system to improve cycle life and performance of lithium batteries. 

Lithium Tetrafluoroborate

Shandong Zhongshan Photoelectric Materials Co., Ltd , https://www.chzsem.com