The consumptive use of white bean (Phseolus vulgaris L.) and its tolerance to drought and flooded conditions

Date

1987

Abstract

The responses of lysimeter-growth white beans to moderate soil-water deficits and its crop coefficients at different stages of growth were determined. Also, the responses of the same crop to flooding durations at three growth stages were studied on size 16 clay pots. The relationship of the seed yield ratio (Ya=actual seed yield over Yp=potential seed yield) to the maximum soil mnoisture tension (SMT) during the reproductive stage is described by the equation Ya/Yo=0.99-0.023 (SMT) within the range of 0.6≤SMT≤4.0. The equations relating the full and actual seed yield ratios to evapotranspiration ratio (actual evapotranspiration) during the total growth period are: Yf/Yp = -15.109 xt^2 + 27.172 xt - 11.447 and Ya/Yp = -12.344 xt^2 + 22.608 xt - 9.347; where Yf is the full seed yield, Ya is the actual seed yield (full seed yield plus the damaged seeds) and xt is the evapotranspiration ratio during the total growth period. The above equations are valid in the range of 0.84≤xt≤1.00. The peak full seed and actual seed yields were obtained when the evapotranspiration ratios were 0.90 and 0.92 respectively. The crop coefficients were 0.88, 0.94, 1.06, 1.11, 1.00 and 0.94 during the early vegetative (11-20 DAS), late vegetative (21-30 DAS), ear;y reproductive (31-40 DAS), mid-reproductive (41-50 DAS), late pod development (51-60 DAS) and harvesting (61-73 DAS) stages, respectively. White bean can tolerate up to a certain critical flood stress index (SIc) expressed in terms of flood duration without a significant reduction in yield. The estimated critical flood stress index could not be estimated but experimental results suggested that it is less than one-half day. The yield response of white bean when flooded during the reproductive stage is expressed by an exponential equation, Ya/Yp=0.8095-0.0239 (SI)^2.5 whereas its yield response when flooded during the vegetative and late pod development stages are logarithmic equations; Ya/Yp = 0.7974-0.3759 log (SI) and Ya/Yp=0.9983-0.3820 log (SI), respectively, where SI is the flooded duration in days. The above equations are respectively valid in the following ranges, 0.5≤SI≤4.0, 0.5≤SI≤10 and 1.0≤SI≤4.0. White bean was observed to be extremely sensitive to flooding during the reproductive stage of growth.

Document Type

Master Thesis

Language

English

LC Subject

Beans

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1987 A2 R49

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