Recently, growers in Liaoning, Heilongjiang, and Shanxi Provinces and other places have reported that corn has a strange phenomenon of short medlar leaves. Specifically, the length of the corn shaft is normal, but part of the shaft is exposed and not covered by cilantro. In some plots, the length of loquat leaves is only one third of the length of the ear; in some plots, loquat leaves are half the length of the ear. There is essentially no grain on the exposed shaft.
In fact, the issue of loose maize cornflake has occurred every year, especially in Shandong and Tianjin in Henan last year. This phenomenon focuses on the red axis, and the white axis is less frequent.
The corn husk bag has a scientific name called "maize dew top", and the corn dew top refers to that the ear of female corn is shorter than the cob, and the cob cannot be covered, leaving part of the cob exposed.
Due to the short loquat leaves, the grains are exposed to the outside, affecting the grain filling, resulting in a reduction in yield; in addition, the loquat leaves are short and easy to insect. For example, the double-spotted beetle insects bite off the filaments and the beetle eats the grain, which also causes a reduction in yield.
I. Causes of corn stubble short stubble, what factors caused
Corncrops are mainly caused by unbalanced growth during various periods. Although the cotyledons and cobs of the maize ear grow and grow at the same time, the temporal lobe first ceases to grow, and the normal growth of the panicle extraction exceeds the length of the temporal lobe, resulting in the open top.
The main reasons leading to the slow growth and insufficient growth of loquat leaves are:
1. Drought and Water Shortage: The jointing stage is the period of corn ear differentiation, and the high temperature at the jointing stage is met with drought (card neck drought), which results in the non-synchronous differentiation of the temporal lobe and the ear, resulting in a short temporal lobe phenomenon.
2. Weather conditions: Rainy weather, lack of light, insufficient temperature, and reduced photosynthesis, resulting in slow growth and lack of growth of the loquat leaves, which may not grow as long as they should. Spike extraction normally grows beyond the loquat leaves, leading to the tops of the leaves.
3. Over dense planting: Excessive planting density results in poor ventilation and light transmission conditions during the late growth period of the corn, affecting the normal growth of corn.
4. Variety factors: Individual varieties are more sensitive to environmental changes, and there may be unsynchronized development of temporal lobes and ears when climate conditions change.
5, the reason for the drug: spray control agents or triazole drugs before tasseling can also cause the development of temporal lobe ear not synchronized.
6, the lack of soil fertilizer. In the absence of boron in the soil, it has an adverse effect on the formation and pollination activity of male male pollen. In the absence of zinc, white spots appear on the old seedling leaves, and they rapidly enlarge to form local white areas and necrotic spots. Internode shortening also makes the growth and development of the ear easier.
Second, how to prevent the short occurrence of corn stubble
1. Strengthen the management of fertilizer and water: One is to apply early panicle fertilizer, apply panicle fertilizer before and after tasselling, and the other is to prevent drought. When the ear of the female ear is out of ear, no water is needed to ensure normal growth of the taro leaves.
2. Pay attention to the variety selection: The red axis varieties of maize have poor temperature resistance (the U.S. is the most sensitive, and the Asia-Europe is relatively better). In case of high temperatures, there are often “unable to contain†or even serious “gap†and Severe "bust tip" phenomenon, reduced production.
It is reported that corn plus red (white axis plus red axis) mixed broadcast matching technology has achieved good results. The hybrid genes were enhanced and re-hybridized on the basis of hybridization. The "double-hybrid" had stronger resistance to stress. White-axis plus red-axis 2:2 mixing is beneficial to increase the weight of one thousand grains and increase the production obviously.
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