Yifeng: a preliminary study on the relationship between seedling emergence rate and temperature and humidity of Chunlan

Yifeng: a preliminary study on the relationship between seedling emergence rate and temperature and humidity of Chunlan

The seedling rate of spring orchid varies greatly due to different varieties. From 20% to 300%, the average seedling rate is generally about 50%, and the seedling rate of butterfly is generally high. Judging from the situation in my area (Ningbo, Zhejiang), the average temperature in late March is about 14 degrees, the first generation buds have sprouted and unearthed, the average temperature in April has been about 18 degrees, the emergence of orchid seedlings has accelerated, and the average temperature in May has been above 20 degrees. The first generation of leaf buds have basically been unearthed and put into leaves (except individual varieties and weak grass). Plum was introduced in mid-late May, and the average temperature in June was 26.5 degrees, which was the best temperature for orchid growth. Although the second generation buds were unearthed at temperatures of more than 20 degrees, they were actually bred in spring (March), and the first generation buds were bred in late autumn and early winter (early November). Leaf buds are formed at a low temperature with a large temperature difference between day and night, the optimum temperature is about 12 degrees, and the temperature difference between day and night is about 10 degrees. During the period of leaf bud formation, the relative temperature is on the high side, and the environmental humidity is preferably above 80 degrees. The first generation of leaf buds are formed from October to November, so the management work is particularly important in these two months. The application of nitrogen fertilizer should be stopped and the wettability of the basin soil should be improved. Special attention should be paid to not letting the basin bottom dry. 1/1000 plant whole and 1/500 potassium dihydrogen phosphate can be used to spray the leaf surface alternately, once every five to seven days, two to three times in a row. In the former dragon grass, it is found that one or two new buds should be stopped, and 1/3000 of the new buds should be sprayed twice, so that all the new buds can take root. If there are too many buds, the new buds are not easy to root and easy to produce grass. At this time, nitrogen fertilizer must not be used to allow new buds to take root in the soil during the winter and enrich Putou. Such new buds can reproduce second-generation buds (stacked buds), and they can all become big grass and strong seedlings, so as to improve the effective seedling rate. If there are third-generation buds, they are generally autumn buds, it is difficult to become big grass and strong seedlings without low temperature, and it is better not to affect germination in the second year. I hope you will discuss it together.