Studies On The Allelopathy Among Several Tropical Plants In Hainan

Looking at the utilization of cultivated land in Hainan, the multiple crop index of the crops is relatively low, 189% only. Because much cultivated land have not been adopted rationally complex cultivated, interspace plant or crop rotation, and so on. The cropping system is relatively backward. Industrial crops, such as pepper, mango, Phellodendron chinense Schneid, etc., are widely planted in Hainan at present with far relative interval. If we can plant some short cycle crops among them, so there can be more considerable. Agriculture complex systematic setting-up needs to analyze various interactions among plants such as industrial crops, crops and pastures, etc. correctly, make out reasonable crop rotation system, choose culture and plant the configuration plan. Among them, research on Allelopathy to compound agriculture systematic foundation and optimization have important meanings.The Allelopathy of several tropical plants in Hainan Island was studied in the present paper. Litchi, pepper, mango, Phellodendron chinense Schneid, cassava, Areca catechu, rubber, guava were used as donors and maize, soya bean, pumpkin, Echinochioa crusgalli, Digitaria sanguinalis (L.) Scop., radish and Styiosanthes guianensis, as receptor. Effects of leaf extracts of the donors and the soil around the donors'root system on the seed germination and growth of the receptors were bioassayed. From extraction by ethyl acetate and n-butanol two solvents, separate it into three parts and carry on the processing to the receptor. The experiment concentrate n-butanol part and column layer separate and detect by MODEL U-1800 UV-Vis Spectrophotometer.The experimental results indicate that plant leaf withdraw liquids from major support bodies influence sprouting and growth of receptor certainly. Phellodendron chinense Schneid leaf withdraw liquid suppress sprouting and growth of the maize, soya bean and pumpkin and all has stronger inhibitory activity on the Echlnochloa crusqalli (L.) Beauv and Digitaria sanguinalis (L.) Scop. growth among them; Mango and pepper leaf withdraw liquids suppress sprouting of pumpkin and suppress growth of Echlnochloa crusqalli (L.) Beauv and Digitaria sanguinalis. Cassava leaf withdraw liquid suppress...