March 20th is the "Spring Equinox", which is just half of the 90th day of the 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.
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 Plain and the Huang-Huai, the vernal equinox is the jointing stage of winter wheat, to seize the northern spring, little rain pouring good jointing, Shi good jointing 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. And reviving growth of the seedlings have reached the total stem 60 mu prior to 800,000 wheat, nitrogen should be implemented after the shift, until the wheat seedling jointing chlorotic groups, and then watering fertilizer, urea Mushi 12 to 15 kg.
Third, dry wheat field, to suppress binding to draw hoe, mention moisture soil moisture, drought resistance higher grain itself. Spring soil as early as possible back to the pulp or rain, with either a fertilizer or open Summer into urea 5-7 kg.
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. % meets the special nutritional needs of its high yield.
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