Lodging of Corn and its Prevention measures

During the growth of corn, rainstorm with strong wind is often encountered, which may lead to different degrees of lodging. According to the analysis of different lodging, the lodging degree can be aggravated by the following reasons except wind and rain.

? 1. The main reasons for lodging are:

1. Variety. The varieties with underdeveloped root system, tall plant, thin and weak stem and lack of toughness are easy to cause lodging. There are three types of maize lodging: stem lodging, root lodging and stem breaking.

2. Fertilizer and water management is not scientific. The one-time application of fertilizer at the seedling stage led to the vigorous growth of maize at the seedling stage, the increase of plant height and easy lodging. Or maize seedling stage and jointing stage heavy water and fertilizer, heavy nitrogen light phosphorus, little or no potash fertilizer, easy to cause stem lodging.

3. The root system is underdeveloped. Insufficient phosphate fertilizer, poor root growth, or poor soil preparation quality, shallow roots into the soil, underdeveloped aerial roots, etc., once watered, the roots fall down in the event of wind or rain.

4. The growth is too prosperous before heading. Before heading, if the corn grows too vigorously, the stem tissue is tender and weak, and the phenomenon of breaking occurs in case of wind.

5. the density is too high. One-sided pursuit of high-density yield, too small row spacing or insufficient seedlings, resulting in crowding among plants, slender internodes, loose tissue, stem falling or stem breaking.

6. Diseases and insect pests. Stem damage caused by diseases and insect pests during jointing or before heading is also easy to cause lodging.

? Second, the ways to prevent maize lodging are as follows:

1. Select varieties that support well-developed roots and sturdy stems. First of all, according to the characteristics of the varieties, the varieties with developed roots, stout internodes under the panicle, sturdy plants and good flexibility were selected.

2. Reasonable close planting. According to soil fertility and variety characteristics, reasonable close planting and full use of light energy can reduce lodging caused by few and shallow roots and long internodes.

3. Rational fertilization. According to the planned yield and soil fertilizer supply of maize, the formula fertilization of nitrogen, phosphorus and potassium was carried out, and combined with the law of fertilizer demand of corn, the suitable period and amount of fertilizer application were determined, which could effectively prevent lodging. Apply sufficient base fertilizer and seed fertilizer, and focus on the use of nitrogen fertilizer in the big trumpet mouth period. On the basis of ensuring the sowing quality, squatting seedlings properly and applying more phosphorus and potassium fertilizer at seedling stage.

4. Spraying regulator to promote the sturdiness of straw. For those varieties whose stalks are fragile and easy to fold, drug treatment can be taken, such as spraying corn fortifier or Jindele, and chemical control treatment of corn stalks at jointing stage.

5. Timely prevention and control of diseases and insect pests. Close attention should be paid to the control of corn borer, armyworm and red spider, and timely control of diseases and insect pests should occur.