The physiological role of phosphorus (P): Phosphorus plays an important role in cell division and flowering. Improve the resistance of crops (disease-resistant, cold-resistant and drought-resistant) to promote root development, especially the growth of lateral and fine roots. Accelerating flower bud differentiation, early flowering and maturation play an important role. Phosphorus also participates in important physiological activities such as energy conversion, photosynthesis, sugar and starch decomposition, nutrient transport, and inheritance of crops.
Symptoms of phosphorus deficiency in plants: Phosphorus deficiency at seedling stage, dark greenish reddish stems and leaves, starting from the lower leaves, first with dry tips, spreading along the margins of the leaves to the base, and then dark brown, later gradually developing to young leaves, roots Dysplasia, accumulation of excessive sugar in the body, the leaves are purple, stems are weak, slender; ear differentiation and development is poor, the top of the ear shrinks, and even empty ears, delayed extraction of filaments, so that poor fertilization, ear curl, will appear Baldness, lack of grain and irregular rows of grains.
The reasons for the lack of phosphorus in corn: Early spring corn sowing, in case of low temperature, soil moisture is prone to induce phosphorus deficiency. In addition, acid soil, red soil and yellow soil are susceptible to lack of available phosphorus.
Control methods: Based on organic manure and phosphate fertilizers, if phosphorus deficiency is found, early application of diammonium phosphate 20 kg/mu can also be carried out, and 0.2-0.5% potassium dihydrogen phosphate solution can be applied later.
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