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Vol. 10, Special Issue 12 (2021)

Effect of glyphosate on soil enzymes and nutrient availability in medium deep black soils

Author(s):
Vinitha Chandupatla, AD Kadlag and SD Kale
Abstract:
A field experiment of effect of glyphosate on soil enzymes and nutrient availability on medium deep black soils was conducted at STCR farm, MPKV, Rahuri during 2019-20. The experiments was laid out in randomized block design with 3 replications and seven treatments viz., Absolute control, glyphosate herbicide application @ 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 litre ha-1 with three replications. The soil of experimental plot was clay in texture, slightly alkaline in reaction, low in available nitrogen, medium in phosphorus and organic carbon and high in potassium. The soil dehydrogenase enzyme activity in field was significantly higher in glyphosate application @ 0.5 litre ha-1 on fallow land and their residual effect in maize crop at 0, 30 and 60 DAA (1.32, 1.50 and 1.82 µg TPF g-1 soil hr-1 respectively) and 30 and 60 DAS (8.25 and 8.45 µg TPF g-1 soil hr-1). The urease enzyme activity was significantly more in 0.5 litre ha-1 on fallow land and their residual effect in maize crop at 0, 30 and 60 DAA and 30 and 60 DAS (95.23, 84.25 and 75.23 µg NH4-N g-1 soil hr-1 and 49.73 and 50.23 µg NH4-N g-1 soil hr-1 respectively and on par with 1.0, 1.5 and 2.0 litre ha-1 respectively). The acid phosphatase enzyme activity was the highest in 0.5 litre ha-1 glyphosate application on fallow and their residual effect in maize crop at 0, 30, 60 DAA and 30 and 60 DAS (21.97, 16.73 and 16.93 µg PNP g-1 soil hr-1 and 29.50 and 32.47 µg PNP g-1 soil hr-1 respectively) and also for alkaline phosphatase enzyme activity (26.90, 33.80 and 29.33 µg PNP g-1 soil hr1 and 20.10 and 25.83 µg PNP g-1 soil hr-1 respectively). The residual soil organic carbon was slightly increased in glyphosate application @ 0.5, 1.0, 1.5 and 2.0 litre ha-1 (0.62, 0.65, 0.61 and 0.59% respectively). The residual soil available nitrogen, phosphorus and potassium significantly more in glyphosate application @ 0.5 litre ha-1 (263.42, 10.85 and 464.0 kg ha-1 respectively). It was on par with 1.0, 1.5 and 2.0 litre ha-1 glyphosate application for soil available phosphorus and potassium. The least soil available nitrogen, phosphorus and potassium was in 2.5 litre ha-1 glyphosate application (200.70, 9.05 and 442.35 kg ha-1 respectively) followed by 3.0 litre ha-1 (203.84, 9.25 and 445.15 kg ha-1 respectively).
Pages: 140-144  |  391 Views  132 Downloads
How to cite this article:
Vinitha Chandupatla, AD Kadlag and SD Kale. Effect of glyphosate on soil enzymes and nutrient availability in medium deep black soils. The Pharma Innovation Journal. 2021; 10(12S): 140-144.

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