Planting wheat and grasping spring tube according to the characteristics of late sowing wheat

Every year there are always some wheat field sowing time late, late sowing wheat characteristics: First, the tillering period is short. Due to late sowing, late emergence, no tillering stage before winter, and generally less than 20 days of tillering stage in spring, there are fewer tillers per plant and fewer tiller roots, which are the main reasons for slow growth in spring. Second, the stem is short in the ground. Due to the low temperature before winter, the tiller node grows slowly and buried deeply, which affects the early emergence of seedlings in spring. Third, the internode is short. According to observation, the first and second internodes of late sowing wheat are only about 2/3 of the node length of timely sowing wheat, so the late sowing wheat plants are short and difficult to lodge in the later stage. According to the above characteristics of late-sowing wheat, the following three items should be mainly grasped in spring management:

1. In early spring, hoe more, fine hoe, improve the ground temperature, promote its early seedlings. The key time for hoeing and warming to promote early seedling development is in the "freezing and thawing period" of night freezing and thawing. During this period, hoeing and evenly increasing the ground temperature can promote early seedling development. According to the measurement, the temperature of wheat field hoeing is generally 0.5~0.8℃ higher than that of wheat field without hoeing and loosening, which can promote early rejuvenation for 3~5 days.

2. Remove soil and clear ridge, increase temperature to win glory, promote early tillering and fast growth. Clearing ridge in early spring can increase soil temperature at tiller node, increase light area of wheat seedling and promote tiller growth. Especially to sow deeper, bury pressure wheat seedling heavier wheat field effect is more obvious. The experiment proved that the soil temperature of tiller node after clearing was 1.6~2.1℃ higher than that of uncleared ridge, one more leaf per plant, one more tiller, 50 ~ 80 thousand more ears per mu, and the yield could be significantly increased.

3. Water and fertilizer storm rise period, contend for ear more, promote ear big. Late sowing wheat seedlings in early spring because of small roots, water and fertilizer requirements are not very urgent, so not very dry generally do not water early, so as not to reduce the ground temperature, hardening soil, affecting development. Practice proved that the best benefit period of the first water and fertilizer in spring was around the "rising period", and at the same time, 50~60 jin ammonium bicarbonate and 30~40 jin phosphorus fertilizer were applied per mu in combination with watering, which could increase the number of ears per mu and increase the number of seeds per ear.