Journal ArticleDOI
Studies on crop-legume behaviour in pure and mixed stands
TLDR
It is suggested that stimulation of the crop is related to nitrogen enrichment of the soil due to the nodular bacteria in the root of the weed and in nutrient-rich soils at a given plant density.Abstract:
The behaviour of wheat and Trigonella polycerata L. was studied in pure and mixed stands at two nutrient levels in the soil. Wheat responded to increasing density by extreme plasticity whereas the legume responded both by mortality and plasticity. In mixtures, an increase in the density of T. polycerata resulted in an increased dry weight yield of the crop and only at very high densities of Trigonella was there an adverse effect of the weed on the crop. It is suggested that stimulation of the crop is related to nitrogen enrichment of the soil due to the nodular bacteria in the root of the weed. The legume itself suffered from the presence of the crop. T. polycerata showed considerable interplant variation, the range of variation was greater at low densities and in nutrient-rich soils at a given plant density.read more
Citations
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Book ChapterDOI
Biological efficiencies in multiple-cropping systems
TL;DR: In this paper, the biological efficiencies in multiple-cropping systems are discussed and the most intensive use of time and space occurs with the simultaneous or near-simultaneous plantings of two or more crops.
Journal ArticleDOI
Pest management in multiple cropping systems
TL;DR: In this article, the authors discuss ways in which insect behaviour and population dynamics are modified by the nature of the cropping system during the colonisation, establishment and population development phases of an infestation.
Insect, weed and plant disease management in multiple cropping systems.
TL;DR: Much knowledge has accumulated, and this acquired information is slowly providing a basis for designing crop systems so that pest problems and the need for active control measure: are minimized.
Journal ArticleDOI
Integrated Weed Management in Herbaceous Field Crops
TL;DR: In this article, a 4-step approach is proposed: (i) prevention, based on the management of the soil seedbank and the improvement of the crop competitiveness against weeds, (ii) weed mapping, aiming at knowing the biological and ecological characteristics of weeds present in the field, (iii) decision-making process on the basis of the critical period of weed control and weed thresholds and iv) direct control (mechanical, physical, biological and chemical).
Book ChapterDOI
Agroecological benefits from weeds.
TL;DR: It is argued that progress towards more expansive and sustainable notions of weed management will require new theories of weeds and weed management that are based on a broader view of the agroecological roles of weeds.
References
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Soil and plant analysis.
TL;DR: Piper as discussed by the authors presents a survey of methods for soil and plant analysis, with a focus on a specific analysis or group of related analyses, and gives the working details of all or nearly all the existing methods.
Book ChapterDOI
Competition Among Crop and Pasture Plants
TL;DR: The fuller understanding of competition among plants requires a greater knowledge of the response of plants to their environment, especially of theresponse to the environmental stresses created by neighbors.
Journal ArticleDOI
Competitive efficiency of weeds and cereal crops
TL;DR: It is shown that success in competition depends on readiness and uniformity of germination under adverse moisture conditions, the ability to develop a large assimilation surface in the early seedling stage, the possession of a large number of stomata and a root system with a large mass of fibre close to the surface but with its main roots penetrating deeply.