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For the North, the vernal equinox is the beginning of spring, and for the South, the vernal equinox is already in the spring season. With the arrival of the vernal equinox, the appropriate planting period for many different types of crops across the country has arrived. The season does not wait for people, we must grasp the farming activities.
In the North China region and the Huanghuai Plain, the vernal equinox is the jointing stage of winter wheat. In the north, it is necessary to quickly pour the water and extract the jointed fertilizer. Jointed fertilizer is a key top dressing for high-yield wheat. Wheat grows vigorously during jointing stage. It has long stems and leaves, and differentiates the ears of wheat. It requires more nutrients. At this time, grasping fertilization can increase the number of spikes and seed setting rate. Jointing fertilizer is mainly applied to quick-acting nitrogen fertilizer. The appropriate amount and appropriate time for jointing fertilizer should be classified according to the condition of the seedlings and the situation of the land. It is necessary to prevent the loss of premature aging and reduce the production of small and small grains, and to prevent over-fertilization, causing lodging and reducing production. From the appearance of high-yielding wheat, it is normal to have leaf color fading during jointing stage. It reflects that wheat has transferred from vegetative growth to reproductive growth stage, and central leaves should not grow. Therefore, when the leaves of this wheat group are faded, it is also the most suitable when the first section of the base is elongated to a fixed length. At this time, the base fertilizer not only does not cause lodging, but is conducive to strong stalks and large ears; while the seedlings are too strong, the leaves are still green, and the large and drooping wheat fields can be applied or not delayed until the leaves are chlorotic. Otherwise, the group will become too large and the stems will be weak and cause lodging to reduce production. It can be seen that wheat jointing fertilizer is very important, and the mastery of fertilization technology is very important.
Taking North China as an example, the application principle of winter wheat jointing fertilizer is as follows: According to the classification of seedlings due to soil: First, for the wheat fields with severe drought, yellow spotted seedlings and dead seedlings, watering and seedlings are immediately after the soil is thawed. The principle of using nitrogen fertilizer to separate and topdress. When returning to green, first apply urea 5~7 kg to promote early seedling growth. When the jointing is to be carried out, the nitrogen fertilizer should be applied according to the appropriate amount of seedlings; the wheat field suitable for two urea application is also the irrigated wheat field with the total stem number less than 450,000 before the greening, and the second time after the spring is followed by the watering in the jointing stage. ~15 kg of urea.
Secondly, the seedlings in the saplings before the greening of the total number of stems of 45 to 600,000 irrigated wheat fields, combined with the ups and downs of the acres to chase urea 10 to 14 kg. In the wheat field where the total number of stems of the seedlings has reached 60-800,000 before the greening, the nitrogen fertilizer should be moved backwards. When the wheat seedlings in the jointing stage appear to be chlorotic, the topdressing and watering are applied, and the urea is applied for 12-15 kg.
Third, the dryland wheat fields should be combined with the slashing and slashing, to improve the drought resistance of the wheat itself. In the early spring, the soil is returned to the pulp or rain, and 5~7 kg of urea is applied by chemical fertilizer or ditch.
Regarding the nitrogen application rate of winter wheat joint fertilizer in the middle and lower reaches of the Yangtze River: 20% of the total nitrogen fertilizer applied to common wheat is used as joint fertilizer, while on strong gluten wheat, the proportion of joint fertilizer is increased to 40%~50 of the total nitrogen fertilizer. %, in line with its special nutritional needs for high yield.
(Expert: Senior Consultant of Sinofert, Professor of Agricultural University of China, Cao Yiping)
Farmers Daily 
Applying wheat jointing fertilizer during spring equinox
Vernal equinox: Applying wheat jointing fertilizer on March 20th is the "spring equinox". This day is just half of the 90th day of spring, so it is the name. The folks are known as the proverbs of "the equinox and the autumn equinox." After the vernal equinox, the night is short and the temperature is getting higher. “Spring equinox†has an important impact on agricultural production activities.
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