Effects of paclobutrazol, mepiquat chloride and daminozide on growth and yield of snap bean (Phaseolus vulgaris L.)
1996
Rattanaporn Ratananukul
Effects of two application methods, viz. soil drench and foliar spray, and five concentration levels, viz. 100, 200, 300, 400 and 500 ppm of paclobutrazol, mepiquat chloride and daminozide on growth and yield of Broker snap bean were investigated. Results showed that paclobutrazol retarded internode length and height of snap bean. Accumulation of root dry weight was also increased in paclobutrazol treated plant, whereas leaf area, stem and leaf dry weight were trended to decrease. Application of mepiquat chloride and daminozide trended to improve snap bean growth. Height, leaf area, stem, leaf and root dry weight and chlorophyll content in the leaves were also increased, whereas internode length was decreased. However, application of plant growth retardants had no effect on accumulation of nitrogen and phosphorus in the leaves. The effect of growth retardants on yield of snap bean depended on type of growth retardants, method of applications and concentration levels. Mepiquat chloride produced the highest fresh pod, dry pod and seed yields followed by daminozide and paclobutrazol treated plants respectively. Foliar spray of mepiquat chloride was more effective in improving yield components of snap bean than soil drenching application. By contrast soil drenching application of paclobutrazol and daminozide was more effective than foliar spray. The optimum concentrations of mepiquat chloride, daminozide and paclobutrazol to be used for improving snap bean growth and yield were 400, 300 and 100 ppm respectively. Furthermore, the promotion of seed germination and inhibition of seedling growth from paclobutrazol, mepiquat chloride and daminozide treated plants were also investigated.
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