When is the best time to control excessive growth in yam? Master the key timing

Controlling excessive growth and chemical control in yam refers to a technical measure of using chemical agents to control excessive growth when yam grows too vigorously and stems and leaves grow leggy. To do a good job of chemical control, the first thing is to find the root cause of excessive yam growth; only by treating the cause can the efficacy of the chemicals be brought into play, so that they achieve their proper effect.

The purpose of controlling excessive growth is to shape a highly efficient light-receiving trellis surface, reasonably distributing the most leaves within a given space to obtain the highest photosynthesis, thereby increasing yield.

Begin applying chemicals to control excessive growth when the yam vines are close to covering the trellis or have reached 2/3 coverage.

The length of the stems and vines is most affected by internode length, so controlling internode length is very important. In that case, if chemical control is carried out when the vast majority of internode lengths have already become fixed, the timing for chemical control has clearly been missed, and it is meaningless for reducing stem and vine length; only the side effects of chemical control will be reaped. Therefore, the first chemical control should be early rather than late.

In addition to chemical control, the ratio of base fertilizer and topdressing should also be controlled. Fertilizer use should be adjusted according to the soil fertility of the plot and the appearance and vigor of the yam, so as to achieve the desired effect; otherwise, if nitrogen fertilizer is too high or the fertilizer amount is too large, it will cause control above while promoting below, making the measures contradictory, rendering the measures ineffective, and even harming yield.