Frequent torrential rains with windy weather during corn growth may lead to varying degrees of lodging. According to the analysis of different lodging conditions, in addition to wind and rain, the following reasons can cause the degree of lodging to increase.
The main causes of lodging are:
1, varieties. The underdeveloped root systems, tall plants, thin stalks, and lack of toughness tend to cause lodging. There are three types of corn lodging: stem fall, root fall and stem break.
2, fertilizer and water management is not scientific. The one-time application of fertilizers at the seedling stage leads to prolonged seedling growth, increased plant height, and easy lodging. Or corn seedling stage and jointing stage of large-scale fertilizer, diazo light phosphorus, with little or no application of potassium fertilizer, can easily cause stem lodging.
3, underdeveloped roots. Insufficient phosphate fertilizer, poor root growth, poor soil preparation, shallow roots, and underdeveloped aerial roots. Once watered, the roots collapsed after experiencing wind or wind and rain.
4, before tasseling grow too busy. If the corn grows too profusely before tasseling, the stalk tissue will be tender and weak, and it will break when it encounters wind.
5, the density is too large. One-sided pursuit of high-density production, plant spacing is too small or incomplete seedlings, resulting in crowded between the slender, slender internodes, loose tissue, causing stem down or broken stems.
6, pests and diseases. During the jointing period or before the tasseling, pests and diseases are also susceptible to lodging.
Second, ways to prevent corn lodging are:
1, choose to support the root development and stalk sturdy varieties. Firstly, the varieties that support root development, thick internodes under the ear, strong plants, and good flexibility are selected for the characteristics of the varieties.
2, rational close planting. According to the characteristics of soil strength and species, reasonable close planting and full use of light energy can reduce the lodging caused by less and shallow root systems and long internodes.
3, a reasonable fertilization. Based on the planned maize yield and soil nutrient supply, nitrogen, phosphorus, and potassium fertilization can be combined, combined with the requirement of fertilizer for maize, and the appropriate period and fertilization amount can be determined to effectively prevent lodging. Applying base fertilizer and seed fertilizer, the nitrogen fertilizer is mainly used during the big bell mouth period. On the basis of ensuring the quality of sowing, appropriate seedlings will be planted at the seedling stage and phosphorus and potassium fertilizers will be added.
4, spraying regulators to promote stout straw. For those varieties with fragile vines that are easy to inflection, drug treatment methods, such as spraying corn sorghum or ginseng, can be adopted to chemically treat corn stalks at the jointing stage.
5. Timely control of pests and diseases. It is necessary to pay close attention to the prevention and control of corn borer, armyworm and spider mites, and to prevent and treat diseases and pests in time.
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