Effect of crotonylidene diurea on soil enzyme activity and nutrient availability in a Vertisol

Atul Bhagawan Pawar; M R Chauhan; K D Kale; Kapil Atmaram Chobhe; Anil Kumar Verma; Vivek Kumar Trivedi; Ganpa t Louhar; Rav indra Kumar Rekwar

doi:10.56093/ijas.v90i9.106615

Authors

Atul Bhagawan Pawar Ph D Scholar, Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
M R Chauhan Professor, Department of Soil Science and Agricultural Chemistry, Mahatma Phule Krishi Vidyapeeth, Rahuri 413722 (India)
K D Kale Assistant Professor, Department of Irrigation Water Management, Mahatma Phule Krishi Vidyapeeth, Rahuri 413 722 (India)
Kapil Atmaram Chobhe Scientist, Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
Anil Kumar Verma Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
Vivek Kumar Trivedi Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
Ganpa t Louhar Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar, Maharashtra 413 722, India
Rav indra Kumar Rekwar Ph D Scholar, Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricuraltul Research Institute, New Delhi 110 012

https://doi.org/10.56093/ijas.v90i9.106615

Keywords:

Bacterial population, Crotonylidene diurea, Incubation study, Enzyme activity, Nitrogen release, Urea

Abstract

The release of nitrogen (N) from slow release N fertilizers (SRNF) is affected by soil microbial activity. However, several studies have shown variable results regarding the effect of microbial population size on the release of nutrient from slow release fertilizers. To understand this relationship clearly, changes in activities of two soil enzymes (urease and dehydrogenase), microbial population and available macronutrients viz nitrogen (N), phosphorus (P) and potassium (K) were assessed in an incubation study conducted under ambient condition. The six treatments were used for present investigation as control, 100% urea and crotonylidene diurea (CDU) @ 100, 75, 50 and 25% of recommended dose. The results indicated that the addition of N through commercially available urea and CDU as per general recommended dose of nutrients (GRDN) showed an increase in soil enzyme activity, microbial population, available N, P and K. The urease enzyme activity was found to be highest of nutrients in GRDN treatment at 60 days after addition (DAA) (39.55 μg NH4⁺-N/g soil/hr) and in 100% N through CDU (37.45 μg NH4⁺-N/g soil/hr) at 90 DAA. The soil dehydrogenase enzyme activity was significantly higher in GRDN at 7, 14, 21 and 30 DAA (1.32, 1.44, 1.56 and 1.68 μg TPF/g soil/hr, respectively). However, at 60 and 90 DAA the dehydrogenase enzyme activity was significantly higher in 100% N through CDU (1.89 and 1.63 μg TPF/g soil/hr, respectively). The soil available N content increased up to 60 DAA in all the treatments and it was significantly higher in GRDN followed by 100% N through CDU. However, it was significantly higher at all the periods of incubation over 75, 50, 25 and 100% N through CDU.

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