Effects of reduced irrigation dose and slow release fertiliser on nitrogen use efficiency and crop yield in a semi-arid loamy sand
| Autor: | Abraham Joel, Ingmar Messing, Rui Brito, Mario Chilundo, Ingrid Wesström |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Irrigation Crop yield Soil Science Growing season 04 agricultural and veterinary sciences Drip irrigation 01 natural sciences Crop Water balance Agronomy Loam 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Agronomy and Crop Science Surface irrigation 010606 plant biology & botany Earth-Surface Processes Water Science and Technology |
| Zdroj: | Agricultural Water Management. 168:68-77 |
| ISSN: | 0378-3774 |
| DOI: | 10.1016/j.agwat.2016.02.004 |
| Popis: | Quantification of the interactive effects of irrigation water and nitrogen (N) fertiliser on nitrogen use efficiency (NUE) provides an important insight for more effective water and N management. This study evaluated the effects of different irrigation and N fertiliser management options on water flux, N uptake, NUE and maize grain yield in a semi-arid loamy sand in Mozambique. The experiments were carried out in field plots in two consecutive cropping periods (CP’s) representing contrasting growing seasons: a hot-wet season (CP-1) and a cold-dry season (CP-2). The treatments included two irrigation methods (furrow and drip), two irrigation levels (75 and 100% of the crop water requirement), and two distinct N fertiliser types (a quick-release and slow-release urea) arranged in a randomised complete block design. In both CP-1 and CP-2, NUE tended to be higher for the 75% irrigation level, regardless of irrigation method and N fertiliser type. Higher NUE was generally observed in CP-2 than in CP-1. The highest grain NUE (41.6 kg kg−1 N) was observed in CP-2 under furrow irrigation combined with 75% irrigation level and quick-release N fertiliser. Slow-release N fertiliser did not improve N uptake, NUE or maize yield. Potential N losses were assumed to be higher in CP-1 than in CP-2, associated with higher estimated deep percolation volumes in CP-1 (mean 127 mm) than in CP-2 (mean 12 mm). In CP-1, deep percolation events mainly coincided with high rainfall events. Furrow irrigation tended to give higher NUE than drip irrigation, especially in CP-2. Reducing of irrigation level by 25% tended to increase N uptake, NUE and maize yield for both CP-1 and CP-2. The effects of slow-release N fertiliser and drip irrigation were inconclusive. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect