When is the best time to apply wheat growth-regulator chemicals? Recommended common chemicals

It is said that the more vigorously plants grow, the better, but for crops such as wheat, excessive growth not only leads to various diseases and reduced yields, but also makes the plants prone to lodging, so effective growth regulation is also one of the ways to increase yield. So when is the best time to apply wheat growth-regulator chemicals? Which chemicals can regulate growth?

When is the best time to apply wheat growth-regulator chemicals?

Chemical growth regulation is best done from the regreening stage to the early jointing stage. If growth is regulated during the regreening and jointing stage, the wheat cannot reach a suitable height; if growth is regulated after the jointing stage, the middle internodes become thicker and the plants are more prone to lodging, seriously affecting wheat growth during the heading stage.

Why does wheat need growth regulation?

1. It is prone to frost damage in early spring. Excessive growth makes the wheat stems and branches relatively thin and weak, with many stems and poor cold resistance.

2. It is prone to lodging in the middle and late stages. Growth is luxuriant. With many stems and tillers, light penetration is poor, and thin, slow development means lodging occurs when there is a lot of rain, causing serious losses.

3. It is prone to disease. Vigorous seedlings themselves are of poor quality, and their disease resistance declines, making them prone to sheath blight, powdery mildew, and other diseases.

Growth regulation measures

1. Weak seedlings formed by sowing too early.

Pressing can inhibit the growth of the main stem and large tillers and control excessive growth. Pressing should be done on sunny days; it must not be done in the morning when there is frost or the dew has not dried, so as to avoid damaging the seedlings. After pressing, hoe promptly, and combine with watering, applying about 15 kg of ammonium bicarbonate per mu, and if necessary spray the leaves with a 0.2%-0.3% chlormequat solution, which can also inhibit growth and resist frost damage.

2. Vigorous seedlings formed by sowing too densely.

Some farmers, without considering variety or yield, blindly expand the sowing area, causing a large number of seedlings to crowd together, with unbalanced nutrition and poor development. For this type of wheat seedling, thinning should be carried out to form an appropriate plant spacing and promote individual development.

3. Vigorous seedlings formed by excessive fertilizer and water

In high-fertilizer, high-water plots with sufficient fertilizer and water, plus suitable temperatures, wheat seedlings have many tillers, develop quickly as individuals, have broad leaves, and the field becomes closed and shaded, with lower leaves turning yellow. Field management: deep intertillage to cut roots. When the main stem of the wheat seedling grows to 7 leaves, hoe deeply between the wheat rows to 5-7 cm to cut part of the root system, control nutrient absorption, reduce tillering, control aboveground growth, and cultivate strong seedlings.

Common growth-regulator chemicals