One-year crop rotations with corn or highly resistant soybean were evaluated at four locations for their effect on Rotylenchulus reniformis population levels and yield of a subsequent cotton crop. Four nematicide (aldicarb) regimes were included at two of the locations, and rotation with reniform-susceptible soybean was included at the other two locations. One-year rotations to corn or resistan...

Often, in dynamical systems, such as farmer’s crop choices, the dynamics is driven by external nonstationary factors, such as rainfall, temperature, and economy. Such dynamics can be modelled by a nonstationary Markov chain, where the transition probabilities are logistic functions of such external factors. We investigate the problem of estimating the parameters of the logistic model from data,...

to evaluate the effect of crop rotation on spatial dynamic of fumaria vaillantti and polygonum aviculare a study was conducted at the three farms with different rotation in the astan ghods razavi filed that located at 10 kilometers southeast of mashhad, iran. the rotations were alfalfa- fallow- wheat, canola- fallow- wheat, and wheat- fallow- wheat. at the crosses of 7×7 m quadrangular grids ne...

Biofuels are now an important resource in the United States because of the Energy Independence and Security Act of 2007. Both increased corn growth for ethanol production and perennial dedicated energy crop growth for cellulosic feedstocks are potential sources to meet the rising demand for biofuels. However, these measures may cause adverse environmental consequences that are not yet fully und...

In recent years, the poultry industry has seen a steady growth in Iowa. With the increase in the broiler and egg industry, the public is concerned about the potential threat to environmental quality (surface and subsurface water and air quality) from increased volumes of poultry manure. Although the effect of poultry manure on crop production has been studied, its effects on water quality, unde...

The Industrial Revolution in England was characterised by early and rapid labour release from agriculture to industry. This was facilitated by rising levels of labour productivity in agriculture which permitted labour to be released without excessive upward pressure on food prices. New technology played a central role in raising agricultural productivity but the importance of particular innovat...

this study was conducted to investigate economic aspect and some soil properties in different crop rotations of wheat in dryland conditions in sararood - kermanshah during six years 2006-2012. the experiment carried out based on randomized complete block design (rcbd) with four replications in two neighbor sites. treatments were wheat-wheat, fallow - wheat, chickpea-wheat, vetch-wheat and saffl...

The disposal of organic wastes specially from urban origin is a very serious problem. The recycling through agriculture is certainly one of the best solutions but it means a thorough control of the composition and doses applied, as well as the response of the crops, in production and quality. In this paper we deal with compost of solid urban residues, sewage sludge, and cow manure as a known re...