Malnutrition and lack of kernels are closely related to varieties, soil, fertilizer, water, climate, cultivation and management, and pests and diseases. Its performance is in many forms. One is that there is no grain on the side of the ear from the base to the top, and the panicle is more curved toward the side of the grain defect; the second is that the whole fruit node has few grains, and there is a scattered distribution on the ear; the third is the ear. The top grain is small, white or yellow-white, known as bald tip. Bare tipping is the main form of corn deficiencies, and severe baldness can account for more than half of the entire ear. The prevention and control measures are as follows:
The first is to cultivate good varieties with resistance to diseases, insect resistance and adaptability.
The second is to improve the soil and enhance the soil's ability to retain water and fertility. Promote the use of compost composting and deep plowing and cultivating techniques to improve soil structure, promote corn growth and development, and increase corn's resistance to adverse environmental conditions.
The third is a reasonable fertilization watering. To increase organic fertilizer, with the application of nitrogen, phosphorus and potassium. To prevent droughts and floods, the supply of water should be timely and appropriate after jointing in order to promote the development of male and female ear.
The fourth is to strengthen the cultivation and management. According to species, soil strength and planting methods, determine the density according to local conditions, create good conditions for ventilation and light transmission, meet the light requirements of the middle and upper leaves, and promote the development of male and female; strengthen the cultivator weeding and soil cultivation, using wide and narrow ridge cultivation techniques to improve the ventilation of the field Translucent conditions; when adverse climatic conditions affect normal pollination, artificial pollination techniques should be used.
Glass Venlo Greenhouse is Spire-type glass design, design and installation of windows when more convenient and easy. Its roof slope andle can be appropriately according to the local real climate change the environment.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. the steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using 4 mm thick float glass.
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