| Autor: |
Anjitha Krishna P. R., Dayalbagh Educational Institute (Deemed University), Agra, India, B. Maheshwara Babu, University Of Agricultural Sciences, Raichur, India, A. T. Dandekar, University Of Agricultural Sciences, Raichur, India, R. H. Rajkumar, University Of Agricultural Sciences, Raichur, India, G. Ramesh, University Of Agricultural Sciences, Raichur, India, S. R. Balanagoudar, University Of Agricultural Sciences, Raichur, India |
| Rok vydání: |
2022 |
| DOI: |
10.5281/zenodo.7294736 |
| Popis: |
A physically based vadose zone model, HYDRUS (2D/3D) was used for simulating soil water and nutrient movement in the root zone of mulched onion crop under drip irrigations and weekly fertigations. Alternate days irrigations using 2 lph (litre per hour) emitters and weekly fertigations were found to be appropriate in different soil types for minimum leaching of water (7 to 30%) and nitrate (0.6 to 5%) and maximum root uptakes. Excess application of irrigation (4 lph) at weekly intervals caused leaching of 1000 cm3 of applied water within a day after the irrigation and leaching of nitrate initiated on the 2nd day after the fertigation in sandy loam soil with 71 and 61% loss of applied water and nitrogen at the end of the season. Movement of phosphorus and potassium was very slow compared to nitrate movement and root uptake was maximum in 2lph emitter irrigations at two days irrigation interval with absolutely no leaching. Field experiments and model simulations together provided very good information on soil water and nutrient dynamics and the recommended management practices are expected to be applied in onion cultivation in semi-arid regions to improve bulb yield and to reduce the adverse environmental impact from conventional agriculture practices. KEYWORDS: HYDRUS, Onion, Leaching, Fertigation, Nutrient dynamics |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
