Common Problems and Countermeasures after Wheat Sowing

What about the improper selection of ◇ wheat varieties?

Sowing spring and weak winter varieties in the middle and early stubble plots will lead to the growth of wheat seedlings before winter, which is not conducive to safe overwintering.

Countermeasures: on the basis of early hoe and suppression, cover the soil and surround the roots before winter, or cover with "masked dung" to protect wheat seedlings safely through the winter.

What if ◇ sows wheat too early?

When wheat is sown too early, the leaves are long and narrow, drooping and lack of tillers after the seedlings are unearthed, and the young spikes of the main stem and part of the big tillers enter the two-edge stage before winter, and freezing injury will occur when they encounter a low temperature of-10 ℃ and lasting about 5 hours in winter. Countermeasures: timely suppression, inhibition of the growth of the main stem and large tillers; timely paddling after pressing, combined with watering, 15 kg of ammonium bicarbonate per mu, and foliar spraying of 0.2% chlorpromazine solution if necessary, to control overgrowth and resist freezing injury.

What if ◇ sows wheat too late?

Due to the short growth period and insufficient accumulated temperature before winter, the growth of wheat seedlings is thin and there are few tillers. Countermeasures: to paddle hoe and replenish fertilizer and water, apply ammonium bicarbonate 10 Mor 15 kg per mu in the three-leaf period; in wheat fields with poor soil moisture and fast water seepage, watering tillers in time after the three-leaf stage (but the plots with suitable soil moisture or soil viscosity and poor water permeability should not be watered before winter); the last hoe before freezing should pay attention to choking soil and surrounding roots in order to protect seedlings safely through the winter.

What if the sowing of ◇ wheat is too shallow?

The suitable sowing depth of wheat is 3mi 5cm, the sowing is too shallow (less than 3cm), the wheat seedlings grow creeping, the tiller nodes are exposed, the tillers are many and small, are not tolerant to drought, easy to freeze and premature senescence.

Countermeasures: suppress several times in time before emergence, after emergence combined with hoe around the root, if necessary, cover or apply "covered dung" in the overwintering period to prevent overwintering from freezing.

What if the ◇ wheat is sown too deep?

Wheat sowing too deep (more than 5 cm), slow emergence, called slender, few and small tillers, few and weak secondary roots, yellow and thin wheat seedlings.

Countermeasure: scrape the soil and clear the trees in time. The method is: start from the center of the border with bamboo or iron rags, hug across the ridge, and when you reach the last line, drag all the remaining soil to the back of the border; for wheat sown at the right time, clearing trees before winter usually starts at the second leaf stage and ends at the time of "Lesser Snow".

What if the sowing rate of ◇ wheat is too large?

The results showed that the growth of wheat seedlings was crowded, the plants were yellow, thin and weak, the ontogeny was poor, and there were few tillers.

Countermeasures: first, the seedlings should be thinned in time, especially the "pimple seedlings" in the land, the edge of the ground and the field, so as to establish a suitable population structure and promote individual development, and then combined with watering, a small amount of nitrogen and phosphorus quick-acting fertilizer should be applied to make up for the excessive consumption of soil nutrients.

What should I do if I apply too much base fertilizer to ◇?

With the excessive application of base fertilizer, the wheat seedlings grew too vigorously, there were many tillers, the leaves were broad, and the field was seriously sheltered.

Countermeasures: when the main stem of wheat seedling grows 5 leaves, hoe 5Mel 7 cm deep between wheat rows, cut off part of the secondary roots, control nutrient absorption, reduce tillering and cultivate strong seedlings.

What if there is not enough soil moisture after ◇ broadcast?

The performance is that it is difficult for wheat seedlings to be unearthed, or the tillers are born slowly after emergence, the leaves are gray-green, the heart leaves are short, the growth is slow or stagnant (commonly known as "shrinking seedlings"), the basal leaves turn yellow and dry, and the roots are few and thin.

Countermeasures: after sowing, check the soil moisture in time, carry out small water irrigation for the plots where the soil moisture is insufficient or dry, carry out small water irrigation if there is no water irrigation condition, and suppress the soil moisture twice in time without water irrigation conditions.

What if the soil is too wet after ◇ sowing?

After the wheat seedlings were unearthed, the leaves were yellowish, the tillers were born slowly, and when the leaves were serious, the leaf tips became white and dry.

Countermeasures: timely deep ploughing and dispersing moisture ventilation, and topdressing a small amount of available fertilizer to promote the early development of seedlings.

What should I do if the seedlings do not emerge completely after ◇ sowing?

After sowing wheat, the emergence of seedlings should be checked in time, once the lack of seedlings is found, pay close attention to make up. The method is: ① supplementary planting. Select the same variety as the seedling-deficient plot, soak the seeds at suitable temperature, accelerate germination, or soak them in 25000-fold naphthalene acetic acid or 500x potassium dihydrogen phosphate solution for 12 hours, then sow seeds to facilitate seedling emergence and growth; ② transplanting. For the plots where there is no time for replanting and there is still lack of seedlings after replanting, the seedlings can be transferred and replanted in the tillering stage of wheat. The transplanting wheat seedlings should choose the strong seedlings with three tillers, the transplanting depth should be "no immersion on the top, no white on the bottom", and the transplanting time should not be later than "Lesser Snow" at the latest, in order to slow down the seedlings and overwinter.