Effect of Irrigation in the Tea Field Using Intercept Apparatus of the Rain

Abstract

Effects of irrigation in the tea field was investigated for 4 years from 1974 to 1977 by using intercept apparatus of the rain.
Amount of 15 mm, 20mm, 25 mm and 30 mm were irrigated when pF at a depth of 15 mm in the plot of 30mm attained 2.8 (1975) or 2.5 (1976 -'77).
The yield of green leaf was the following order;30mm>25mm>20mm>15mm plot.
Irrigation had little effect on the lst crop of green leaf, but had an effect on the 2nd and 3rd crop of green leaf.
For the number of buds there was no difference among treatments at lst crop, but at the 2nd and 3rd crop of green leaf, the more amount of watering was, the more number of buds was.
The weight of bud was the same as the case of the number of buds.
Evapo-transpiration of tea plant was about 2mm per a day in March and April, 2-3mm in May-July, 5-6mm in Auggust and 2-3 mm in September-October. respectively.
Evapo-transpiration decreased according as value of pF increased.
Evapo-transpiration of tea plant was related to climatic factors and showed the high co relation to solar radiation, sunshine duration, air temperature and evaporation,
Soil moisture in March-July was extractedmainly from upper layer and in August-October mainly from lower layer.
From the results of soil moisture extraction, amount of irrigation and yield of green leaf, it was considered suitable that the volume of TRAM was irrigated at pF 2.3 in the tea field.