EFFECT OF PHOSPHORUS AND PHOSPHORUS SOLUBILIZING BACTERIA (PSB) ON SOIL PHOSPHORUS AVAILABILITY, YIELD AND NUTRIENTS UPTAKE BY SUMMER GREEN GRAM 3705
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Date
2023-07
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Publisher
JAU JUNAGADH
Abstract
Phosphorus, Green gram, Nutrients content & uptake, Yield, Available
nutrients, PSB and Enzyme activity
A pot experiment entitled “Effect of phosphorus and phosphorus solubilizing
bacteria (PSB) on soil phosphorus availability, yield and nutrients uptake by summer
green gram” was conducted during the summer, 2022 in the net house of Department
of Soil Science & Agricultural Chemistry, College of Agriculture, Junagadh
Agricultural University, Junagadh. The pot experiment comprised 16 treatment
combinations having four levels each of phosphorus viz., 0, 20, 40 and 60 kg ha-1
and
phosphorus solubilizing bacteria (PSB) viz., 0, 1, 2 and 3 L ha-1
in factorial
completely randomized design repeated thrice were tested in the experiment, in
respect of growth parameters, yield attributes, yield, protein content, content and
uptake of nutrients like N, P, K and S at harvest by seed & straw and their total uptake
by green gram crop, the status of soil available nutrients viz., N, K and S at harvest,
Periodical P status, bacterial population and acid and alkaline phosphatase enzyme
activity in the soil at 30, 60 DAS and at harvest of the crop.
The experimental soil was medium black calcareous, clayey which was
slightly alkaline in reaction, pH2.5 (8.0) and EC2.5 (0.49 dS m-1
), low in available
nitrogen (225.80 kg ha-1
), medium in available phosphorus (39.49 kg ha-1
) and
sulphur (17.20 ppm) and high in available potash (346.93 kg ha-1
).
The results revealed that growth parameters, yield attributes, yield, quality
parameters, nutrient content & uptake in green gram, bacterial population, available
nutrients and phosphatase enzyme activity in soil were significantly influenced by the
various levels of phosphorus and PSB.
The application of 60 kg P2O5 ha-1
significantly increased the plant height,
number of branches, number of nodules, number of pods, number of seeds per pod,
ABSTRACT
seed yield, straw yield, protein content in seed, nitrogen and phosphorus content in
seed and straw as well as uptake of nutrients like N, P, K and S by seed, straw and its
total uptake by the green gram crop. Whereas, phosphorus application did not exert
any significant effect on 100 seed weight, K and S content in seed and straw of green
gram.
The application of 3 L PSB ha-1
significantly increased the plant height,
number of branches, number of nodules, number of pods, number of seeds per pod,
seed yield, straw yield, protein content in seed, nitrogen and phosphorus content in
seed and straw as well as uptake of nutrients like N, P, K and S by seed, straw and its
total uptake by the green gram crop. However, 100 seed weight, K and S content in
seed and straw of green gram did not influence by PSB application.
The data on soil analysis showed that availability of nutrients like N, K and S
after harvest of green gram remains unaffected under the application of phosphorus
and PSB. while, the soil phosphorus availability, acid and alkaline phosphatase
enzyme activity at 30 & 60 DAS and at harvest were significantly increased by the
application of phosphorus and PSB. Application of PSB significantly increased
phosphorus solubilizing bacterial population at 30 & 60 DAS and at harvest in soil,
while, effect of phosphorus application was found non-significant.
The significant interaction effect of phosphorus and PSB application were
observed only in the case of available phosphorus at 60 DAS and at harvest, acid and
alkaline phosphatase enzyme activity at 30 & 60 DAS and at harvest, respectively in
soil under combined application of 60 kg P2O5 ha-1
along with 3 L PSB ha-1
.
Overall the application of phosphorus 40 kg ha-1
and phosphorus solubilizing
bacteria 3 L ha-1
exhibited significant enhancements in terms of growth parameters,
yield attributes, grain yield, straw yield and protein content in seed. It also exerted
their favorable effect on nitrogen and phosphorus content in plant and on soil
phosphorus availability as well as uptake of nutrients like N, P, K, and S by grain and
straw of green gram. Combined application of phosphorus 40 kg ha-1
along with
phosphorus solubilizing bacteria 2 L ha-1
increased acid and alkaline phosphatase
enzyme activity at 30 and 60 DAS and harvest.