EFFECT OF POTASSIUM HUMATE APPLICATION ON SALTSTRESSED PHASEOLUS VULGARIS PERFORMANCE

Document Type : Research articles.

Authors

Botany Department, Faculty of Agriculture, Fayoum University, Fayoum

Abstract

The objective of this study is to assess the ameliorative impact of
potassium humate (KH; 0, 100, and 200 kg per feddan) as soil amendments on
the growth traits, green and dry yields characteristics, leaf photosynthetic
pigments, chlorophyll fluorescence, and leaf content of nutrients of common
bean (Phaseolus vulgaris L., cv. “Bronco”) plants grown under saline soil
conditions. To perform the study aim, two field trials were conducted at the
Experimental Farm of Faculty of Agriculture, Fayoum University during the
2016 and 2017 summer seasons. The obtained results showed that, Na+ content
was significantly declined, while the all other tested parameters such as
growth characteristics (i.e., shoot length, number of leaves plant‒1, area of
leaves plant‒1, and shoot fresh and dry weights plant‒1), yield characteristics of
green pods and dry seeds (i.e., average pod weight, number of pods per plant,
pods weight per plant, dry seed weight per plant and 100-seed weight), leaf
photosynthetic pigments (i.e., total chlorophylls, total carotenoids) contents
and leaf chlorophyll fluorescence (i.e., Fv/Fm and PI), leaf contents of N, P,
K+, and Ca2+, and the ratios of K+/Na+, Ca2+/Na+ and K++Ca2+/Na+ were
significantly increased by the all KH treatments compared to the control
(without KH). The two KH treatments conferred, approximately, the same
results. Therefore, results of this study recommend using KH at 100 kg per
feddan to optimize the common bean performance in saline soils.

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