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- W813432872 abstract "There was a concentrated heavy rain resulted in 450mm of precipitation from Aug. 18 and 19, 1972. Almost all the paddy grown in the main plain areas of KimPo, Bu Cheon and Pyong Taek(N. L. 00'98'30'56, Long. 45'9955'92E) have been damaged of submergency. The effects of the different degrees of submergency in different growth stages of paddy, on the yield of paddy, rates of fertilization, maturity and degree of heading have been observed, and may be summarized as follows. (1) When the paddy was damaged due to submergency at the heading stage, a) on the basis of normal paddy, the yield of paddy may be expected about 67,57,40,9 and 6% with the submerged periods of 0.5, 1. 0, 2.0, 3.0 and 4.0 days, respectively, and a significant-negative correlation was found between the periods of submergency and the yields. b) As in the yield of paddy, rapid decreases in the rates of fertilizations and maturities of paddy were found as the submerged periods are increased. When the submerged periods are 0.5, 1.0, 2.0, 3.0 and 4.0 days, the corresponding rates of fertilizations and maturities observed are 89 and 88,83 and 78,52 and 40,24 and 19, and 12 and 9%, respectively, showing significant negrative correlations. c) Considerable decreases of the degree of heading were found as the submerged periods are increased. resulted in a significant negative correlation at 1% level between the degree of heading and submerged periods. (2) When the paddy plants were under submergency just before heading, the damage was found to be less than that at heading stage. The yields were 86,82,60,36 and 10%, as compared with the normal yield, with 0.5, 1.0, 2.0, 3.0 and 4.0 days of the submerged periods. (3) When the paddy was under the submergency at the mid-stage of head sprouting, its damage was severer than that of just before heading stage. The yields of paddy under the different submerged periods, 0.5, 1.0, 2.0, 3.0 and 4.0 days, were 79, 64, 34 and 6%, respectively, of the normal yields. normal yields." @default.
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- W813432872 date "1972-01-01" @default.
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- W813432872 title "Effects of Submergency due to Heavy Rains on the Yield of Paddy" @default.
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