Search results for "weed competition"
showing 2 items of 2 documents
Maize-based low-input cropping systems can provide effective weed control while ensuring crop productivity
2016
Conventional Maize Monoculture (MMConv) is now questioned for environmental reasons. During a five-year field experiment, yield and weed pressure of MMConv was compared to three low-input Cropping Systems (CS) : MMLI, a Low-Input Maize Monoculture; MMCT, a Conservation Tillage Maize Monoculture; Maize-MSW, Maize rotated with Soyabean and Wheat, all designed to reduce water pollution. In 2014 and 2015, weed-free zones were established on all CS. Weed biomass was higher in MMCT, especially for spring grasses and perennials. MMConv (11.3±1.1 T ha-1) and MMLI (10.6±2.3 T ha-1) had higher grain yields than MMCT (8.2±1.9 T ha-1). Finally, concerning yields observed in weed-free zones, MMCT yields…
Nitrogen uptake and nitrogen fertilizer recovery in old and modern wheat genotypes grown in the presence or absence of interspecific competition
2015
Choosing genotypes with a high capacity for taking up nitrogen (N) from the soil and the ability to efficiently compete with weeds for this nutrient is essential to increasing the sustainability of cropping systems that are less dependent on auxiliary inputs. This research aimed to verify whether differences exist in N uptake and N fertilizer recovery capacity among wheat genotypes and, if so, whether these differences are related to a different competitive ability against weeds of wheat genotypes. To this end, 12 genotypes, varying widely in morphological traits and year of release, were grown in the presence or absence of interspecific competition (using Avena sativa L. as a surrogate wee…