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Prevention of Natural Flowering in Pineapple (Ananas comosus) by Shading and Urea Application
Meng-Tzu Lin,Alfred Ming Chen1,Tzong-Shyan Lin,Ching-San Kuan,Ching-Lung Lee,Wen-Ju Yang 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.1
The year-round production of pineapple (Ananas comosus var. comosus) is often interrupted by natural flowering during winter in Taiwan. A stable and promising technique for preventing natural flowering is required. In this study, we have tested the effect of shading and urea application on the flowering of pineapple. Shading 90% of sun light(s) before mid-November delayed the natural flowering of pineapple and the delay was affected by the plant age. For pineapples planted less than 11 month before mid-November, applying 1% urea plus shading treatment (SN) completely inhibited natural flowering. All the flowering-inhibited plants could be forced to flower by applying calcium carbide. Long-term shading might result in a decreased number of fruitlets within a fruit. However, 6 weeks of recovery before forcing flowering was sufficient for plants to produce fruits with quality equal to that of the control plants. In winter, pineapple plants that were prone to flowering tended to accumulate more leaf starch and increase their C/N ratio. The SN treatment increased the leaf nitrogen concentration and thus effectively maintained a low leaf C/N ratio. Furthermore, flowering-inhibited plants exhibited a constantly low level of leaf starch during the winter and their flowering forced by calcium carbide did not accompany with leaf starch accumulation.
Chin-Hsing Chang,Tzong-Shyan Lin,Wen-Ju Yang 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.6
To improve mango anthracnose management in Taiwan, the critical timing when anthracnose invades mango panicles is a priority subject. A 3-years field study was conducted by inoculating panicles at different developmental stages with 105 conidia/mL suspensions. Invading panicles at the full blooming stage resulted in 67.2% of panicles without setting any fruit and 61.1% of the fruitlets dropped, highest latent infection rate in the unripe fruits, and highest infection rate and largest infected area in the ripe fruits during the postharvest stage. Based on the data provided, we concluded that full blooming stage was the critical stage for C. gloeosporioides control in mango production,and suggest that controlling the population of field pathogens before full blooming stage should be emphasized in routine practice.