EFFECT OF PHOSPHORUS AND PHOSPHORUS SOLUBILIZING BACTERIA (PSB) ON SOIL PHOSPHORUS AVAILABILITY, YIELD AND NUTRIENTS UPTAKE BY SOYBEAN 3724
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Date
2023-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
JAU JUNAGADH
Abstract
A pot experiment entitled “Effect of phosphorus and phosphorus solubilizing
bacteria (PSB) on soil phosphorus availability, yield and nutrients uptake by soybean”
was conducted at Net House, Department of Soil Science and Agricultural Chemistry,
College of Agriculture, Junagadh Agricultural University, Junagadh on clayey texture
soils during kharif, season of 2022 having low available N and medium of available P,
high in available K and medium in available S and alkaline in reaction (pH 7.98).
The experiment comprised of 16 treatment combination having 4 levels of P (0,
40, 60 and 80 kg P2O5 ha-1
) and 4 level of PSB (0, 1, 2 and 3 L PSB ha-1
) carried out in
completely randomized design replicated at thrice, in respect of growth parameters,
yield attributes, yield, content and uptake of nutrients like N, P, K and S at harvest by
seed & stover and their total uptake by soybean crop, the status of soil available
nutrients viz., N, K and S at harvest, 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 results revealed that application of 80 kg P2O5 ha-1
significantly increased the plant height, number of branches plant-1
, number of nodules
plant-1
, number of pods plant-1
, number of seeds pod-1
, seed yield (6.75 g plant-1
), stover
yield (15.56 g plant-1
) and 100 seed weight. Phosphorus content in seed and stover as
well as uptake of nutrients like N, P, K and S by seed and stover. Whereas, phosphorus
application did not exert any significant effect on protein content in seed, N, K and S
content in seed and stover of soybean.
Soil analysis included soil available nutrients like N, K, and S after harvest of
soybean remains unaffected under the application of phosphorus. While, the soil
phosphorus availability, acid and alkaline phosphatase enzyme activity at 30, 60 and at
harvest were significantly increased by application of 80 kg P ha-1
. Whereas, effect of
phosphorus application was found non- significant on phosphorus solubilizing bacteria
population at 30, 60 and at harvest.
Application of PSB 3 L ha-1
significantly increased the plant height, number of
branches plant-1
, number of nodules plant-1
, number of pods plant-1
, number of seeds
pod-1
, seed yield (6.37 g plant-1
), stover yield (15.02 g plant-1
) and 100 seed weight,
phosphorus content in seed and stover as well as uptake of nutrients like N, P, K and S
by seed and stover of soybean. However, protein content in seed, N, K and S content in
seed and stover of soybean did not influence by PSB application.
The data on soil analysis showed that the availability of nutrients like N, K and
S after harvest of soybean unaffected under the application of PSB.
While, the soil phosphorus availability, phosphorus solubilizing bacterial population
and acid and alkaline phosphatase enzyme activity at 30, 60 and at harvest were
significantly increased by the application of 3 L PSB ha-1
.
The combined effect of phosphorus and PSB found significant in respect of P
uptake by seed with phosphorus (35.06 mg plant-1
) under the combined application of
P3 (80 kg P2O5 ha-1
) and PSB3 (3 L PSB ha-1
). Acid (52.26, 62.76 and 58.34 µg PNP
g
-1
soil hr-1
), Alkaline phosphatase activity (154.40, 168.30 and 162.12 µg PNP
g
-1
soil hr-1
) at 30, 60 and at harvest, respectively in soil under combined application
of P3 (80 kg P2O5 ha-1
) and PSB3 (3 L PSB ha-1
) at 30 DAS, 60 DAS and at harvest and
acid phosphatase activity (µg PNP g-1
soil hr-1
) higher values of these parameter
recorded with phosphorus P3 (80 kg P2O5 ha-1
) and PSB3 (3 L PSB ha-1
) .
Over all, the application of phosphorus at 60 kg ha-1 with PSB at
3 L ha-1
plays crucial role for obtaining maximum qualitative yield and maintain soil
phosphorus status.