One of the most important tasks for grapes in autumn and winter is to promote nutrient reflux, allowing the nutrients in the leaves to flow back to the branches for storage and prevent loss along with leaf drop. Today, let's talk about why we need to promote nutrient reflux and how to do it.

The normal nutrient reflux is manifested as the branches and leaves turning yellow and falling off relatively evenly from bottom to top, which is different from the symptoms of magnesium deficiency.

1. The Importance of Nutrient Reflux

First, provide nutrients for the sprouting and inflorescence development next year.

Before the leaves of grapes grow to the size of eggs in the second year, their photosynthetic capacity is insufficient, and the nutrients they produce cannot meet the needs of sprouting. Therefore, the nutrients required during the budding stage mainly come from the parts stored within the tree. Only by ensuring adequate nutrient reflux can we guarantee vigorous and uniform sprouting in the following year.

Second, enhance the tree's resistance to low winter temperatures.

In some areas, early spring is prone to late spring cold snaps, so it is even more necessary to pay attention to promoting the return of nutrients. One of the hazards of late spring cold snaps is that the cell fluid freezes and ruptures the cells, causing irreversible damage. Trees with sufficient nutrient storage have a higher concentration of cell SAP, similar to sugar water. The higher the concentration, the lower the freezing point. Therefore, trees with abundant nutrients have stronger resistance to low temperatures.

2. How To Promote Nutrient Reflux

First, control excessive growth.

After fruit picking, as there is no fruit to suppress, the branches tend to grow vigorously. The leaves on the vigorous branches are small and tender, unable to fully carry out photosynthesis and accumulate nutrients. Instead, they consume the nutrients of the tree. Therefore, after fruit picking, it is necessary to pay attention to controlling excessive growth. It can be carried out by controlling water or pruning the branches back.

When cutting back, it should be noted that at least 8 functional leaves should be retained. If the lower leaves are severely aged, they can be removed and more leaves should be left on the upper part of the branch to ensure that there are sufficient functional leaves to produce nutrients.

Second, manual intervention.

The method can be selected based on the actual situation: If there is sufficient time, urea and potassium dihydrogen phosphate can be sprayed on the leaves. This method is relatively gentle and conducive to the full return of nutrients. If time is tight, ethephon can be sprayed on the leaves to promote leaf drop. Leaves will fall in about 3 days, which is relatively fast, but the nutrient reflux is not sufficient.

Third, ensure a healthy root system.

Especially when applying base fertilizer by opening furrows, be careful to avoid excessive root breakage to ensure that the damaged root system can recover as soon as possible. If the root damage is too severe, it is better not to dig furrows. Instead, you can choose a solution like the "Monband® No-Furrow Bottom Fertilizer Plan", which includes Monband® MBT PULI-NANO(MBT SUS)+ Monband® GuYu ®+ Monband® XiGu ®.

Monband® GuYu ® and Monband® XiGu ® can provide comprehensive macronutrient and micronutrient nutrients. Monband® MBT PULI-NANO(MBT SUS) is a liquid organic fertilizer produced by MBT biological enzymatic hydrolysis technology, containing high organic matter content, highly active humic acid and secondary metabolites of various bacteria. It can improve soil quality, alleviate problems such as salinization and compaction, nourish the root system, help grapes achieve nutrient return, and promote uniform sprouting in the following year.