关键词: 晚季施肥, 养分元素, 苗木生长, 苗木生物量, 苗木抗寒性

Abstract:

Late-season fertilization(LSF), which is developed for preventing nutrient dilution during seedling hardening, is usually performed after the establishment of seedling apical bud. It has been found that late-season nutrient dilution can be alleviated by LSF. Seedling hardening, new root growth, growth, nutrient uptake, and survival after planting could be enhanced by LSF. Also, bud break might be advanced as well. However, most previous reports on LSF focused on fertilizer of nitrogen, whereas the effect of potassium on seedling cold hardiness is inconclusive, and other nutrient elements used as LSF are even much less reported. Usually LSF is applied for quite limited times, or at a constant rate. LSF, with a steady-state nutrient loading has been proven to significantly improve nutrient uptake during hardening.

Key words: late-season fertilization, seedling, nutrient, nitrogen, phosphorus, potassium