After the Spring Festival, the temperature began to rise, winter wheat gradually began to grow, and at the same time, various diseases and cordyceps in the dormant period gradually entered the breeding and harm. Therefore, after the Spring Festival, wheat not only needs to be fattened and watered, but also needs to be medicated. Which one to do first?
1. Several periods of wheat seedlings
The wheat seedling period is about 150 days, and according to the growth and development characteristics of seedlings, the seedling stage of wheat is divided into tillering stage, overwintering period, rejuvenation period, up stage and jointing stage.
(1) Tillering stage: Before entering winter, under suitable temperature conditions, the rhizomes and leaves of wheat seedlings grow rapidly, when there are more than 50% of wheat seedlings in the field, the first tiller exposes the leaf sheath of about 2 cm, indicating that the wheat has entered the tillering stage, and the large tillers are formed in this period.
(2) Overwintering period: After entering the winter, with the gradual decrease of temperature, the average temperature of the winter wheat area before winter drops steadily below 0-1 °C, and the aboveground part of the wheat seedlings stops growing and tillering stops, indicating that the wheat seedlings have entered the overwintering period.
(3) Rejuvenation period: After the Spring Festival, with the temperature rising, when the temperature is stable above 5 ° C, the heart leaves of wheat seedlings begin to grow, when more than 50% of the wheat seedlings grow the first new leaf length of about 2 cm, the wheat seedlings begin to turn green, indicating that the wheat enters the rejuvenation period, generally takes about 30 days, at this time the wheat is dominated by stem and leaf growth, the wheat seedlings will continue to tiller, and the spikelets will begin to differentiate.
(4) Up period: When the wheat seedlings turn from creeping growth to upright growth, the leaves begin to converge and tilt, pluck a wheat seedling, peel off the main stem, and the length of the first section at the base is about 0.5 cm, indicating that the wheat has entered the up stage, from getting up to jointing, it generally takes 10 to 20 days, at this time the wheat stops tillering, and the wheat enters the panicle differentiation period.
(5) Jointing period: When more than half of the wheat seedlings in the field grow about 2 cm above the ground in the first section, it indicates that the wheat has entered the jointing stage, and the wheat has entered the panicle formation stage at this time.
2. Wheat management after years
1, weak seedlings: for late sowing, less tillering, frost damage to the wheat field, the year should be promoted mainly, when the temperature is stable above 5 ° C, after the wheat enters the rejuvenation period, we must seize the time to topage fertilizer first, generally about 10 kg of urea per mu. Strips are carried out using a trolley. Promote the tillering of wheat seedlings and increase the effective total number of stems per mu. Before the wheat is jointed, spraying is carried out to prevent field weeds, red spiders, aphids and blight. After the wheat jointing, the urea is chased again. 10 to 15 kg of urea is applied per mu. Increase the tillering rate of wheat seedlings.
2, strong seedlings: the total number of stems per mu in the wheat field of 600,000 to 900,000 plants, after the wheat returns to green, it is necessary to spray the drug first to prevent weeds, aphids, red spiders, blight and other diseases and insect pests in the field, and in the wheat jointing period, topdressing, generally applying urea 15 to 20 kg per mu to improve the wheat panicle rate.
3, wang long seedlings: the total number of stems per mu is more than 1 million plants, the stem and leaf growth of the wheat field, after the wheat enters the rejuvenation period, it is necessary to first spray medicine, timely control of wheat field weeds, aphids, red spiders, striped blight, stem base rot and other diseases and insect pests, wheat after jointing, and then topdressing, generally 10 kg of urea per mu, improve the ear yield of wheat.
If you want to know more about practical agricultural techniques, please pay attention to us