Abstract. The use of statistical models to study the impact weather on crop yield has not ceased increase. Unfortunately, this type application is characterized by datasets with a very limited number samples (typically one sample per year). In general, inference uses three datasets: training dataset optimize model parameters, validation select best model, and testing evaluate generalization abi...

> Sowing crops following cover crops on forage may cause injuries andproductivity reduction, due reasons as allelopathy or glyphosate residues. Theobjective of this study was to evaluate the influence of differing periods betweencover crop (Urochloa ruziziensis) desiccation with glyphosate and sunflower(Aguará 4) sowing in a no-tillage system on crop development and productivity.Two assays were...

1545 Soil Sci. Soc. Am. J. 73:1545-1558 doi:10.2136/sssaj2008.0311 Received 26 Sept. 2008. *Corresponding author ([email protected]). © Soil Science Society of America 677 S. Segoe Rd. Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any informatio...

Introduction Conservation tillage systems using sweep plows or field cultivators leave a high percentage of crop residues on the soil surface, which protects the soil from wind and water erosion (Johnson, 1950; Jones and Johnson, 1982; Allen and Fenster, 1986; Johnson et al., 1974). These systems have been successful in semiarid areas because meager rainfall after plowing does not allow weeds t...

Allelopathic effects of the sunflower verities Helianthus annuus residues were evaluated on some soil properties and their potential against growth parameters proposed successive crops Wheat Triticum aestivumL., Broad Bean Vicia fabe L. Flax Linum UstatissmimL. Sunflower plants chopped incorporated with field after getting seed, then cultivated. The have reinforced macronutrients considered ess...

This study assessed pesticide residues in soils, sediments, and vegetables in the Xuan Khe and Hop Ly communes located along the Chau Giang River in the Red River Delta, northern Vietnam. Samples were collected from agricultural areas within and outside of embankments built to prevent flooding. In Xuan Khe, the soils outside of the embankment were more clayey with higher organic matter contents...

Conservation agriculture (CA) integrates ecological management with scientific agricultural production. CA promotes minimal disturbance of the soil by tillage (zero tillage), balanced application of chemical inputs (only as required for improved soil quality and healthy crop and animal production), and careful management of residues and wastes. CA Promotes application of fertilizers, pesticides...

s. Vol. 2 (Eds M. K. van Ittersum, G. E. G. T. Venner, S. C. van de Geijn & T. H. Jetten), pp. 438–439.WILLIAMS,M. M.,MORTENSEN,D. A.&DORAN;, J. W. (1998).Assessment of weed and crop fitness in cover crop residues for integrated weed management. Weed Science 46, 595–603.YOUNIE, D., WATSON, C. A. & SQUIRE, G. R. (1996). Acomparison of crop rotations in organic farming: agronomic p...

For the 5-year period 1991 to 1995, 1536 vegetable and 802 fruit samples were analyzed. The purpose of this study was to determine if pesticides were present on Ontario-produced fruits and vegetables, and if so, to determine if residues violated maximum residue limits (MRLs). Overall, 31.5% of the samples had no detectable pesticide residues, whereas 68.5% contained one or more residues. Most o...

Cucumber is one of the main vegetables in Iranian food basket. A wide range of pesticides are used for crops protection during the cultivation of vegetables such as cucumber due to heavy pest infestation. Analysis of pesticide residues in food and other environmental commodities have become essential requirement for consumers, producers, and food quality control authorities. This study was aime...