estimated at 4.0 to 4.5 t ha 1 (Illy, 1997; Wopereis et al., 1999), and in general two crops per year are grown. Development of improved fertilizer recommendations entirely based This compares to average yields in the Sahelian and on field experiments is time-consuming and costly. We employed a comSavannah regions of 3.0 to 5.5 t ha 1. The cropping bination of two simulation models and selected...

introduction energy analysis of agricultural ecosystem is essential for sustainable production. the relation between agriculture and energy is very close. agriculture is an energy consumer and the energy supplier. agriculture’s use of energy is recognized in three external inputs: labor, machines, and fertilizers (connor et al., 2011). significant gains in energy efficiency were arisen in agric...

Abstract Water withdrawals for irrigated crop production constitute the largest source of freshwater consumption on Earth. Monitoring dynamics cultivation is crucial tracking water consumption, particularly in water-scarce areas. We analyzed changes water-dependent 650 000 km 2 Central Asian drylands, including entire basin Amu Darya river, once tributary to Aral Sea before large-scale irrigati...

Abstract Plant-parasitic nematodes (PPNs) can cause substantial economic yield losses to many agronomic crops in the United States. A regional-scale survey was completed across 20 counties determine PPNs prevalence Michigan corn and how factors such as soil type, tillage, irrigation, cropping systems influence their distribution. Ten different major genera of were identified fields: Longidorus ...

Irrigated agriculture in South Asia depends on meltwater, monsoon rains and groundwater. Climate change alters the hydrology causes shifts timing, composition magnitude of these sources water supply. Simultaneously, socio-economic growth increases demand. Here we use a high-resolution cryosphere–hydrology–crop model forced with an ensemble climate projections to assess how irrigation supply may...