罗汉果生长动态与叶片矿质营养的研究

对一年生罗汉果种薯苗的生长发育状况和植株体内矿质营养元素含量进行监测,结果表明,6～9月 为罗汉果植株生长速度最快时期,叶片中的N、P、K等矿质营养元素浓度的月变化则随着生长发育的进程而 变化,其中N的浓度变化有两个峰点,分别在5月、7月,P、K的浓度变化最高点分别在6月、7月,N、P和K 的浓度变化最低点分别在11月、10月。相关分析表明,罗汉果植株的月生长总量及各级侧蔓的月生长量与叶 片中的N、P、K含量变化有显著的负相关关系。因此,要提高罗汉果产量,施肥的重点应放在5～9月。6月 以前以有机肥、磷肥为主,施以适量速效性氮肥,10月以后应根据植株的生长状况和叶片中N、P、K含量,施 用适量的N、P、K肥,防止早衰。

Study on the growth and mineral nutrients in leaves of Siraitia grosvenorii

The monthly variation of the growth and mineral nutrient concentration in Siraitia grosvenorii leaves were surveyed. The results indicated that the growth rate was the fastest from June to Sept. And the concentration of N, P and K in leaves varied regularly during the growth period. The peak of the concentration of N in leaves was in May and July,and that of P and K was respectivly in June and July. The lowest concentration of N,P and K was respectively in Nov. and Oct. The correlation indicated that there were notable negative correlation of N,P and K in leaves. Thus,the stress of fertilizing period should be from May to Sep. in order to increase the production of Siraitia grosvenorii fruit. Manure,phosphate and quick-acting nitrogen fertilizer will be applied before June. Preventing decrepitude,suitable nitrogen,phosphate and potash fertilizer respectivly will be applied after Oct. according to the growth and the concentration of N,P and K in leaves.