The causes and Control methods of the latest premature senescence of Rice

The phenomenon of premature senescence occurs when rice is planted. The so-called premature senescence refers to premature senescence, which mainly occurs in the late heading stage of rice, such as withered stems and leaves, poor grain filling and reduced yield due to the increase of shrunken grain. In the folk, it is called "standing stalk death" or "returning straw", so what is the reason for rice premature senescence? I don't know what to do Let's get to know it.

1. Causes of premature senility

1. Low-lying terrain and poor ventilation will lead to excessive accumulation of harmful substances in the soil, which will harm the growth and development of the root system, reduce the vitality, and in serious cases, black root and root rot will occur. In addition, when the soil lacks certain elements, the plant will lead to premature senescence due to lack of nutrients.

2. In planting, because the soil is easy to harden and the permeability is poor, it will lead to poor root growth and weak absorptive capacity, and in the later stage, the plant will appear premature senescence because of cutting off fertilizer.

3. In cultivation, if the planting density is too high, the growth of rice is weak, and if nitrogen fertilizer is applied in fertilization, the application of phosphorus and potassium fertilizer is too little, which will lead to premature senescence of rice in the later stage.

4. Rice premature senescence will be caused by long-term flooding and no dry ventilation, poor root growth in saline-alkali barren land, withdrawing water too early before harvest or planting late-maturing varieties.

5. During the filling period, when the temperature is too low or the light is insufficient, the formation and transfer rate of assimilation will be weakened. When the low temperature of 5-6 degrees is encountered during grain filling, the varieties with low cold tolerance will change color and aging prematurely.

6. in addition, it also has a certain effect on premature senescence and varieties. according to experiments, general dwarf and early-maturing varieties are prone to premature senescence, because the aeration of dwarf varieties is not as good as that of high-stem varieties, while the leaves of early-maturing varieties are thinner and their life span is shorter than late-maturing varieties. So it's easy to age prematurely.

II. Prevention and control methods

For low-lying or saline-alkali land, drainage projects can be built before planting, which can strengthen infiltration, then improve the soil, apply a large amount of farm manure during soil preparation, improve soil structure, reasonably close planting during planting, and ploughing in time. Promote root growth and development. For the fields prone to root rot, first of all, no or less fertilizer with sulfate should be applied, nitrogen fertilizer should be applied less for many times, and base fertilizer and tillering fertilizer should not be applied too much at one time. In addition, according to the fertilization at the seedling stage, increase the application of phosphorus and potassium fertilizer, improve disease resistance, and topdressing the farm manure with high potassium content before the heading stage can prevent root rot.

The above are the causes and control methods of rice premature senescence. I hope I can help you. If you want to know more about it, please pay attention to us.