Effect of plant density and nitrogen rates upon the leaf area of seed sugar beet on seed yield and quality |
| |
| Institution: | 1. Faculty of Agriculture, University of Zagreb, Department of Field Crops, Svetošimunska 25, 10000 Zagreb, Croatia;2. Faculty of Agriculture, University of J. J. Strossmayer, Trg sv. Trojstva 3, 31000 Osijek, Croatia;1. College of Agro-grassland Science, Nanjing Agricultural University, Nanjing 210095, PR China;2. Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA;1. School of Agriculture Food and Wine, The University of Adelaide, Waite Campus, Urrbrae, SA 5064, Australia;2. Department of Plant Science and Crop Protection, University of Nairobi, P.O. Box 29053–00625, Kangemi, Nairobi, Kenya;3. South Australian Research and Development Institute, Waite Campus, Urrbrae, SA 5064, Australia;1. The UWA Institute of Agriculture, The University of Western Australia, M082, Perth, WA 6009, Australia;2. Mallee Focus, 221 Jones Rd, Manangatang, Vic 3546, Australia;3. Falkiner Ag Pty Ltd, 1025 Dickins Rd, Freshwater Creek, Vic 3216, Australia;4. Nicon Rural Services Pty Ltd, 32 Stevens Street, Queenscliff, Vic 3225, Australia;5. Facey Group, 40 Wogolin Road, Wickepin, WA 6370, Australia;6. Western Australian No-Tillage Farmers Association (WANTFA), Leeuwin Centre, CSIRO, 65 Brockway Rd, Floreat, WA 6014, Australia;7. Birchip Cropping Group Inc. (BCG), 73Cumming Avenue, Birchip, Vic 3483, Australia;8. CSIRO Sustainable Agriculture Flagship, CSIRO Plant Industry, Private Bag 5, Wembley, WA 6913, Australia;9. School of Plant Biology, The University of Western Australia, M084, Perth, WA 6009, Australia |
| |
| Abstract: | Three-year field trials were set up on eutric brown soil in northwestern Croatia (Zagreb) with the objective to determine the effect of plant density and nitrogen rates on the formation and size of leaf area of seed sugar beet, and on the yield and seed quality in seed production without transplanting. Investigations should also reveal how much the yield and quality of sugar beet seed depend on the leaf area index (LAI). Four plant densities of seed sugar beet were investigated after crop wintering (40 000, 80 000, 120 000, and 160 000 plants/ha) as well as three nitrogen rates (60, 120, and 180 kg/ha) applied in two identical topdressings: at the beginning of the spring growing period and immediately before shooting of inflorescence stalks. Leaf area formation was strongly influenced by weather conditions. An increase of plant density from 40 000 to 160 000 plants/ha led to a decrease of leaf area per plant. Raised nitrogen rates in topdressing caused an increase of leaf area, depending on the precipitation and soil fertility. Maximum LAI, achieved in the flowering stage, grew almost linearly with increasing plant density (LAI: 1.77–4.85 m2/m2), but was statistically significant only up to 120 000 plants/ha. Raised nitrogen rates in topdressing led to a significant increase of the LAI in the stage of inflorescence stalk shooting, though not in full flowering. On the basis of this research, seed yield and germination of seed sugar beet could not be predicted regarding LAI in the flowering stage. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
