Many growers reflect the strange phenomenon of short leaves in corn. The specific performance is as follows: the length of the corn shaft is normal, but some of the shafts are exposed and not covered by the leaves. Some plots have only one-third of the length of the loquat leaves; some plots have half the length of the spikes. There are essentially no seeds on the exposed shaft.
In fact, the problem of not strict corn leaf is happening every year, especially in Henan and Shandong in Henan last year. This phenomenon is dominated by the red axis and the white axis is less likely to occur.
There is a scientific name called “corn dew top†in corn leaf stalks. Maize apex refers to the shortness of corn ear mites, which is shorter than the cob, and can not contain the cob and expose a part of the cob.
Because the eucalyptus leaves are short, the grains are exposed to the outside, affecting the filling, resulting in reduced yield; in addition, the eucalyptus leaves are short and easy to attract insects, such as the double spotted leaf beetle biting the filaments, the chafer biting the grain, it will also reduce production.
First, the reason for the short glutinous rice leaves, what causes
Corn topping is mainly caused by growth imbalances in various periods. Although the corn ear and the cob are growing at the same time, the stalk leaves stop growing first, and the normal growth of the stalk is beyond the length of the stalk, leading to the topping.
The main causes of slow growth and insufficient growth of the leaves are:
1. Drought and water shortage: The jointing stage is the ear differentiation stage of the ear, and the high temperature is in drought at the jointing stage (ka neck drought), which leads to the unsynchronized differentiation of the leaves and ears, and the short phenomenon of the leaves.
2, the weather reasons: rainy weather, light, temperature is insufficient, photosynthesis is reduced, resulting in slow growth of the eucalyptus leaves, insufficient growth, not longer than the length of the stalk, but the normal growth of the stalks beyond the sacral leaves, leading to the top.
3, excessive close planting: excessive planting density caused by late corn growth, poor light transmission conditions, affecting the normal growth of corn.
4. Variety factors: Individual varieties are sensitive to environmental changes, and when the climatic conditions change, the development of the leaves and ears is not synchronized.
5, the cause of the drug: spray control agent or triazole agent before the tasseling will also lead to the development of eucalyptus leaves are not synchronized.
6, the soil is lack of micro-fertilizer. Boron deficiency in soil has an adverse effect on the formation of pollen and pollination activity of maize male flowers. When zinc deficiency occurs, the leaves of the old seedlings appear white spots, and rapidly expand, forming local white areas and necrotic spots, shortening between nodes, and easily causing abnormal growth of the ear.
Second, how to prevent the occurrence of short corn leaf
1. Strengthen the management of fertilizer and water: First, apply ear fertilizer early, apply panicle fertilizer before and after tasseling, and secondly prevent drought. When the ear is out of the ear, it should not be short of water to ensure the normal growth of the stalk.
2, pay attention to variety selection: corn red axis varieties with poor heat resistance (US is the most sensitive, Asia and Europe are relatively better), in the case of high temperatures often appear "the ears can not contain the leaves", and even the serious "missing" and Serious "bald-tip" phenomenon, reducing production.
It is reported that corn white plus red (white axis plus red axis) mixed broadcast matching technology has achieved good results. Enhance the hybrid gene and re-hybridize on the basis of hybridization. "Double hybridization" has stronger resistance to stress. The white axis plus the red axis 2:2 mixed broadcast is beneficial to increase the 1000-grain weight, and the yield increase is obvious.
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(Source: Agricultural Technology)
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