The soil is barren, the cultivated layer is shallow, and the crops with poor water and fertility retention capacity often suffer from serious corn shortage;

The second is nutritional factors.

Single application of chemical fertilizers, no or less farmyard manure, and improper ratio of nitrogen, phosphorus, and potassium, especially insufficient phosphate fertilizer and boron fertilizer in the soil, or insufficient water and fertilizer supply during the flowering and filling period of corn, which affects the synthesis of organic matter With rotation, the corn is spinning late, the pollen in the field is reduced, and the life span of the pollen and filament is shortened, which causes the corn to lack seeds;

The third is climatic factors.

(1) High temperature and drought. The continuous drought in the mid-growth period of maize causes repeated leaf curling, or encounters high temperature and dry weather during flowering, and insufficient soil water supply affects the development of maize female and male ears, causing part of the pollen to abort or form abnormal pollen, which affects fertilization and formation Empty particles. The flowering and earing period is the critical period of water in corn, which is particularly sensitive to water shortage, affecting the development of female ears, delaying female ear silking, and causing poor pollination. High temperature and drought can easily wither the silk of female ears and lose their viability, resulting in low seed setting rate.

(2) Rainy weather. During the flowering and filling period of corn, the pollen is easy to absorb water and form a cluster, which affects the loosening and pollination or the pollen grains rupture and die due to excessive water absorption.

(3) Wind power. Maize is a cross-pollinated crop, which mainly relies on wind and insects to achieve pollen transmission. Excessive wind or no wind during the flowering and pollination period of maize can affect pollination to varying degrees, which in turn affects seed setting;

The fourth is cultivation management.

Extensive management and excessive planting density can also affect the occurrence of corn shortage;

Fifth, pest damage.

In all stages of corn growth, the occurrence of diseases and insect pests can affect the growth and development of corn to varying degrees, resulting in poor corn growth, especially corn aphids occur when corn is tasseling, making corn unable to flower and pollinate normally, and also cause grain shortage. happened.

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