What regulators do citrus growers need?

Paclobutrazol

It has the effects of delaying plant growth, inhibiting stem elongation, shortening internodes, promoting plant tillering, increasing plant stress resistance, increasing yield and so on.

Application on citrus

① controls summer shoot germination to compete for nutrition, so as not to cause a large number of fruit drop, which has the effect of fruit protection. The use time is in the sprouting stage of summer shoots, which can be used with shoot-killing element and high potassium foliar fertilizer.

② controls the germination of late autumn shoots (winter shoots) consumes nutrients, increases plant nutrient accumulation, and promotes flower bud differentiation. The use time is after the autumn shoot is ripe, there is no hanging fruit with high phosphorus foliar fertilizer, hanging fruit with high potassium foliar fertilizer.

S-elicitor

Also known as natural abscisic acid, it can activate or induce the expression of plant resistance genes, initiate the resistance or adaptation mechanism of plants to stress, improve the ability of plants to resist drought, cold, disease and saline-alkali resistance, and regulate plant growth. improve the quality of agricultural products and improve the viability of crops in abnormal climate and soil conditions.

Application on citrus

① can promote flowers and buds and provide the basis for fruit preservation. The use time is citrus florescence, combined with cytokinin and boron fertilizer.

Low concentration of ② S-inducer can dredge the vein of fruit trees and play a role in sprouting and shoots. After the last batch of shoots are ripe, they can be used with cytokinins and foliar fertilizer to promote autumn shoots.

③ promotes the flower bud differentiation of citrus, and the use time is after the autumn shoot is mature, pay attention to the concentration. Shoot promotion is 4000 times, flower promotion is 2000 times.

④ citrus awakening, the use time is from Greater Cold to the Beginning of Spring, combined with cytokinin, Hongku and boron fertilizer can also improve the fruit yield.

Cytokinin

It can not only promote cell division and regulate its differentiation, but also delay the degradation of protein and chlorophyll and delay senescence.

Application on citrus

① protects fruit, and cytokinin has a significant effect on preventing the first physiological fruit drop. The use time is 7 days after flowering, and can be used in conjunction with gibberellin.

② promotes the growth of autumn shoots and horizontal buds, so that the fruiting mother branches accumulate more nutrients. The use time is after the last batch of shoots are ripe.

③ citrus awakening during the period from Greater Cold to the Beginning of Spring.

Gibberellin

It can accelerate cell elongation, promote cell division, and promote cell expansion. In addition, gibberellin also has the physiological effects of inhibiting maturation, dormancy of lateral buds, senescence and tuber formation.

Application on citrus

① gibberellin had a weak effect on reducing the first physiological fruit drop, but could significantly inhibit the second physiological fruit drop. The use time is before the first physiological fruit cracking and the second physiological fruit cracking, the first time can be used with cytokinins.

② reduces the number of flowers, and for trees that do not hang fruit next year, gibberellin can also be sprayed in December, once at the beginning and the end of the month.

Matters needing attention

one

Understand the way regulators act.

When using, it is necessary to understand the characteristics of regulators, such as gibberellin, cytokinin and so on, which can promote shoot growth and fruit protection, while paclobutrazol inhibits vegetative growth and promotes reproductive growth.

Can be used in conjunction with the use, but can not be mixed at will, such as paclobutrazol should not be mixed with gibberellin, cytokinin, so as not to affect the efficacy or adverse effects.

two

Control the use time flexibly

When using the regulator, it should be used flexibly according to the tree potential, weather and other conditions to achieve the best effect. For example, when the autumn shoot grows to the later stage, when there are more Rain Water and the temperature is suitable, the autumn shoot is easy to grow greedy and green, at this time, paclobutrazol can be sprayed early and the source pool of phosphorus and potassium can be added to promote the autumn shoot to mature, enrich and thicken as soon as possible.

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three

Pay attention to the concentration

Very often, if the concentration is not properly grasped, it will have a serious impact. To take a simple example, 2mam 4murine D butyl ester, high concentration is herbicide, low concentration is regulator. For example, the concentration of gibberellin to prevent young trees from blooming is generally 100~200ppm, if it is too high, it will lead to narrow leaves.

This article is compiled and organized by the agricultural assistant team. Please indicate the source of the agricultural assistant when reproduced.