Rice–weed competition in response to nitrogen form under high and low transpirational demand
نویسندگان
چکیده
Implementation of water-saving irrigation practices in lowland rice results increased availability nitrate (NO3−) the soil and favours germination upland weeds. Since plant species show a specific preference for either ammonium (NH4+) or NO3− as nitrogen (N) source, changes both concentration weed flora may affect competition between Further, transpirational demand atmosphere might growth competitiveness (wetland) (dryland) weeds differently due to their adaptation different ecological environments. Therefore, study aimed evaluate effects N source on growth, uptake common under high low vapour pressure deficit (VPD). Two (Oryza sativa) varieties (NU838 KD18) differing characteristics two (Echinochloa crus-galli Solanum nigrum) natural habitat were selected grown hydroponically monoculture mixed culture at VPD. was supplied 75%/25% 25%/75% NH4+/NO3−. rates measured first week, whereas dry matter (DM), plant, total activities reductase glutamine synthetase fresh leaves determined weeks after onset treatments. Independent E. took up larger share NH4+, S. nigrum NO3−. hardly affected by led significantly higher nigrum. NU838 showed against than KD18. In competition, decreased but NU838. High VPD did not DM nigrum, leading demand. Competitiveness appears be an important trait relative communities correlated with activity N-assimilating enzymes leaf stronger response Our support hypothesis that aerobic soils advantageous weeds, especially VPD, it disadvantageous
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ژورنال
عنوان ژورنال: Journal of Agronomy and Crop Science
سال: 2021
ISSN: ['1439-037X', '0931-2250']
DOI: https://doi.org/10.1111/jac.12562