Thidiazuron (TDZ)
Thidiazuron is a defoliant widely used in cotton cultivation. After thidiazuron is absorbed by plants, it can promote the natural formation of the separation tissue between the petiole and the stem and fall off, and it has a strong activity of promoting cell division, making the bolls ripen and cracking early, easy to pick, and can also increase cotton yield by 10% to 20%.
Thidiazuron is also a fruit-leavening agent. Thidiazuron can be used as a defoliant when the concentration is high and can play a role in expanding fruit when the concentration is deficient. Thidiazuron has strong cell division activity, its ability to induce plant cell division and callus is more than a thousand times higher than that of general cytokinins, promote fruit enlargement, delay plant senescence, enhance its stress resistance, and promote plant growth. Photosynthesis, increase crop yield and improve crop quality. Therefore, thidiazuron is also often used as a leavening agent in grape cultivation.
The domestic consumption of thidiazuron is about 500 tons per year, and the foreign purchase volume is 600-700 tons per year. Judging from the registration of preparations in the past two years, the registration of plant growth regulators has become more and more favored by enterprises. From 2013 to 2016, there was only technical registration, no preparation registration, and the number of technical registrations in 2016 decreased significantly; in 2017 The number of technical registrations was 22, a significant increase over the previous year, and the number of registrations for preparations was 100 in that year alone. In 2018, the rolls of technical preparations were basically the same as the previous year, and the number of registrations for preparations increased by 159. In recent years, the growth rate of plant growth regulators has ranked first in the annual consumption of pesticides in the world, and my country is one of the major cotton-producing countries. Therefore, as a new and efficient plant growth regulator, thidiazuron has a good market prospect and is developing rapidly. Larger space.
When it comes to cotton cultivation, we often think of ethephon. The effect of ethephon for ripening is well known, but the defoliation effect is not as good as that of thidiazuron. At the same time as ethephon ripening, the cotton plants quickly lose water and die, and the young bolls at the top of the cotton also wither, resulting in a serious reduction in cotton production. And thidiazuron can make cotton ripen early, and cotton bolls are relatively early, and concentrated, and the proportion of cotton before frost is increased. Cotton does not clip shells, does not drop flocs, does not drop flowers, increases fiber length, and improves lint, which is conducive to mechanical and manual harvesting. In addition, the efficacy of thidiazuron lasts for a long time, and the leaves will fall off in a green state, which completely solves the problem of "withering and does not fall", reduces the pollution of leaves to machine-picked cotton, and improves the quality and efficiency of mechanized cotton-picking operations. At the same time, it also has a strong inhibitory effect on aphids. Therefore, thidiazuron is more and more widely used in cotton cultivation.
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