Causes and Control of Secondary growth of Potato

Nilek County has long and narrow terrain and cool climate, which is suitable for the growth of cold crops. Potato has always been the dominant local crop. After years of in-depth investigation and research by technicians, the causes of secondary growth of potato and the corresponding solutions were found out.

First, the secondary growth of potatoes

In the first ten days of August 2003, 1.3 hectares of potato sown in the fifth village of Nilke town in late April, the tuber has expanded as big as an egg, the new potato bud eye germinated and grew small potato the size of thumb, while the new potato grew old and no longer expanded. This phenomenon also occurs in other plots with similar potato cultivation conditions.

Second, the reasons for secondary growth

1. Growth habit

In the process of potato growth and development, when the temperature is above 29 ℃, the stems and leaves grow only, the tubers stop growing and gradually aging. After that, if rainfall or watering occurs, the external conditions such as temperature and humidity needed for tuber growth and development are satisfied, which can lead to tuber bud eye germination and secondary growth of new tubers.

two。 Climatic conditions

Since July 2003, our climate has been sunny and rainy, and the temperature rises and falls between 5 and 32 ℃, which is extremely abnormal, which is the main reason for the secondary growth of potatoes.

3. Management measures

In the early stage of potato growth, excessive application of nitrogen fertilizer, Nongdazhuang, dilatonin and other foliar fertilizers resulted in sufficient or even excess water and fertilizer, which led to large foliar growth and excessive plant growth, resulting in excessive plant density, and the corresponding management measures failed to keep up with it in time. As a result, the expansion growth of potato blocks was inhibited.

III. Countermeasures

1. Pay attention to sowing density

The row spacing of 70 × 20 cm is more suitable.

two。 Strengthen cultivation management

Remove too many leaves from the rhizome of the plant to slow down the problem of plant density and high nutrient consumption. Timely topdressing of available phosphorus and potassium fertilizer, or 0.1% concentration of dwarftin, inhibited the overgrowth of plants.

3. Cultivate soil and raise ridges

Remove the top flowers of the plant and promote the growth of potato tubers.