top pruning

In 2001 , an experiment on cultivation measures to improve the quality of upper tobacco leaf was carried out in Changshun county with an aim to explore the suitable nitrogen application norm and the time of top pruning .

为探索优质烟生产适宜的施N水平和打顶时间，于2001年进行了上部烟叶质量调控措施的试验。

Study on Afforestation Effect of Vessel Seedlings of Pinus massoniana by Top Pruning

马尾松剪顶容器苗造林生长效果研究

Study on the Conditioning Effects of Undercutting and Top pruning on Slash Pine Bareroot Seedlings

切根、截顶对湿地松裸根苗生长调控效果的研究

Study on Top Pruning for Female Parent and Suitable Fertilization Technigue in Seed Reproduction of Hybrid Rape ( Brssica napus ) in Autumn Sowing

甘蓝型三系杂交油菜秋播制种母本打薹及适宜施肥技术研究

But it was more advantageous to reduce the proportion of upper leaf and improve its quality at the nitrogen application level of 97.5 kg / ha and top pruning at 50 % of tobacco plants blossom .

但以667m2施纯N6.5kg、50%中心花开时打顶，有利于降低上部叶比例和提高上部叶质量。

Effects of Root - pruning and Top - pruning on Seedling Quality of Pinus elliottii

切根和截顶对湿地松苗木质量的影响