What is the total height of the stalk nodes in the big trumpet stage of corn?

About 100cm. Different places and climates will be different.

The big trumpet stage of maize is a stage in which vegetative growth and reproductive growth go hand in hand At this time, the 1 1 leaves of corn spread out, and the upper leaves protrude like big horns. At this time, the plant has formed about 60%, and the male panicle has begun to differentiate into small flowers, which is the key period for the formation of grains per panicle. At this time, if sufficient fertilizer and water are beneficial to increase the number of grains per ear, it is the key period of maize fertilization. Fertilization accounts for about 60% of the total fertilization, mainly nitrogen fertilizer, and it is also important to supplement a certain amount of potassium fertilizer. At this time, if the fertilizer supply is insufficient, it will inevitably lead to large plants, small ears and low yield.

From maize to big horn stage (leaf age index is 55%-60%, 1 1- 12 leaves spread), the big horn stage of maize is from jointing stage to heading stage, which is a stage of simultaneous vegetative growth and reproductive growth. The growth of roots, stems and leaves is very vigorous, the volume expands rapidly, and the dry weight increases sharply. Practice has proved that the implementation of various measures to increase production during this period can achieve remarkable results. Therefore, the trumpet stage is the key period for the growth and development of maize and the implementation of various management measures. In order to ensure the high and stable yield of maize, the field management must be meticulous: 1. Topdressing at trumpet stage is the most demanding and intensive period of maize life, and topdressing should be strengthened at this stage to prevent fertilizer loss. Fertilization should be widely carried out according to soil fertility and seedling conditions, with 30-35 kg urea per mu, which should be applied after deep digging and covered with soil after fertilization. Corn fields with good growth can be applied less or moderately slowly; On the contrary, it should be applied more and applied in advance; If the growth is too poor, potassium dihydrogen phosphate or high-efficiency concentrated humic acid liquid fertilizer 120- 150g 2-3 times per mu should be applied, and sprayed every 5-7 days/time, with obvious effect. Second, there are strong requirements for nutrition, moisture, light and oxygen in the big bell mouth period. Intertillage can loosen soil, improve ventilation and water and fertilizer supply, thicken soil layer at the base of plants, promote root growth and prevent plants from lodging. At the same time, it can remove weeds and save water and moisture. Therefore, intertillage is an important measure for the management of corn in the big trumpet period. It is not advisable to raise the soil too early in the big bell mouth period, and the height of raising the soil is 6- 10 cm. After soil cultivation, spraying water with corn bran or spermidine ethyl ester per mu can reduce the plant height and ear position of corn by 15%-20%, effectively balance the relationship between vegetative growth and reproductive growth, not only prevent lodging, but also improve the yield of corn, generally increasing the yield by more than 15%. It is required to spray evenly to avoid spraying again or missing spraying. If it rains within 8 hours after spraying, reduce the dosage and spray again as appropriate. Third, the big trumpet period of watered corn is in the high temperature season, and the water demand and evaporation for plant growth are increasing day by day, which is the key period for corn water demand. Watering can also change the microclimate in the field, which is beneficial to maize flowering and pollination, improve the fruiting rate of ear and realize high yield and high efficiency of maize. Generally, the small bell mouth period and the large bell mouth period should be watered separately, and the small bell mouth period should have a small amount of water, which can be ditched alternately, and the large bell mouth period should have sufficient water. At the same time, we should always pay attention to the weather, so that waterlogging can be discharged and drought can be watered. Four. Prevention and control of pests and diseases During this period, corn borer, armyworm, cotton bollworm and leaf spot will occur to varying degrees, so it is necessary to investigate the occurrence of pests and diseases in the field at any time. If there are pests, it is best to wash the heart with toxic soil made of phoxim or diphacinone. In case of diseases, apply 600 times of Antaisheng or bactericide solution +300 times of potassium dihydrogen phosphate or other foliar fertilizers for foliar spraying, and spray the liquid evenly.