A study of some factors in plant susceptibility to translocated herbicides in rice

Date

4-1962

Degree

Bachelor of Science in Agriculture

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Jose R. Velasco

Co-adviser

F. C. Manuel

Abstract

Data from other studies incidentally incidentally that ancillary factors affect the susceptibility of plants to regulator-type herbicides. The results of pertinent studies on these factors are reported in this paper

Using the angle between the tillers and the mother plant and that between the leaf blade and the projection of the leaf sheath as criteria of susceptibility, the writer noted that (1) the higher the nitrogen level in the soil the more susceptible were the rice plants; (2) the older the plant, the less susceptible it was; and (3) the less water supply the plant had, the less susceptible it was to 224-D. In other words, the less active was the metabolism and meristematic growth of the plant the less susceptible it was.

The more polar compounds of 2,4-D like the sodium salt were less effective than the non-polar compounds Like the isopropyl ester. The alkyls were more effective than the dimethylamines. This could be a result of more rapid penetration of the cuticle by non-polar thon by polar compounds.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Notes

Botany

Document Type

Thesis

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