Transpiration and leaf resistance of some field crops

Date

1-1980

Degree

Bachelor of Science in Agriculture

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Enrique P. Pacardo

Abstract

Corn, cotton, sorghum, soybean, and tobacco were grown in plastic pails and at full canopy stage were transferred to a wind tunnel with E wind velocity of 150 cm/sec and a light intensity of 5500 lux. Hourly transpiration war measured by the weighing method for 24 hours, 12 hours light and 12 hours dark. Leaf resistance was measured with the automatic porometer.

Cotton had the highest transpiration rate and sorghum had the lowest. Corn, tobacco, and soybean had decreasing rates In that order.

The transpiration rate and leaf resistance of the five crops were Inversely related, high rate of water loss means low leaf resistance and vice versa.

Cyclic variation in transpiration and leaf resistance occurred because high transpiration combined with high root resistance produces a leaf water deficit which causes stomatal closure. The resulting reduction in transpiration permits recovery of leaf turgor and reopening of stomata.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Notes

Botany - Plant Physiology

Document Type

Thesis

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