Competition Between Upland Rice and Purple Nutsedge for Nitrogen, Moisture, and Light
| Autor: | S. K. De Datta, L. I. Okafor |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
0106 biological sciences
education.field_of_study Oryza sativa media_common.quotation_subject Population chemistry.chemical_element 04 agricultural and veterinary sciences Plant Science Upland rice Biology 01 natural sciences Nitrogen Competition (biology) 010602 entomology Agronomy chemistry Loam Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries education Agronomy and Crop Science Cyperus rotundus media_common |
| Zdroj: | Weed Science. 24:43-46 |
| ISSN: | 1550-2759 0043-1745 |
| DOI: | 10.1017/s0043174500065383 |
| Popis: | Field experiments were conducted on clay and clay loam soils at the International Rice Research Institute to investigate the effects of competition between upland rice (Oryza sativa L.) and varying populations of purple nutsedge (Cyperus rotundus L.) for nitrogen, moisture, and light on the grain yield of upland rice. ‘IR5’ was used in 1972, while the experimental line ‘IR442-2-58’ was used in 1973. Grain yields of ‘IR5’ and ‘IR442-2-58’ increased with 60 kg/ha of nitrogen, and decreased with increased purple nutsedge population. The application of nitrogen to weedy upland rice fields benefited the purple nutsedge more than the rice. Purple nutsedge and upland rice competed extensively for moisture and the competition was much more serious with increased nitrogen fertilization. Purple nutsedge competition reduced the light transmission ratio (LTR). The reduction was proportional to the increase in purple nutsedge population density. Reductions in the LTR were greater at higher nitrogen levels during the three seasons. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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