estimation of optimum fertilizer rates is needed because of growing economic and environmental concerns. optimum fertilizer rates can be determined by fitting statistical models to yield data collected from n fertilizer experiments. the main goal of this research was to compare and evaluate quadratic, square root, mitscherlich, rectangular hyperbola, linear plus plateau and quadratic plus plate...

in order to study the effects of different irrigation system and different amounts of nitrogen fertilizer on yield and quality of sugar beet, an experiment was conducted at ekbatan research station, hamedan during 2005-2006 as split plot based on randomized complete block design  with three replications. the main plots were irrigation systems (furrow, sprinkler and drip irrigation) and subplots...

abstract petroleum pollution is one of the most common and dangerous pollutions that is due to petroleum industries such as refineries, and consequently of oil pipes and tanks leak causing environmental pollutions. one of the newest born technologies in this area is phytoremediation, in which plants are used for decreasing of petroleum pollution. this technology is used for remediation of soil,...

Aim of the study: To evaluate consequences for pork quality traits replacing soybean meal with Narbon vetch in pig diets.Area Castilla-Leon, Spain.Material and methods: 48 Duroc × Iberian barrows were fed diets 0% (V0), 5% (V5), 10% (V10) 20% (V20) inclusion vetch. Pork investigated 1) intramuscular fat, protein moisture content fresh loin, 2) fatty acid composition subcutaneous 3) sensory attr...

Mixed cropping systems can constitute important agroecological adaptation strategies for enhancing crop growth and productivity in view of climate change, while reducing the need synthetic fertilizers providing ecosystem services. The aim this study was to investigate growth, competitiveness, two forage mixtures combining triticale (X triticosecale Wittmack) common vetch (Vicia sativa L.), fenu...

There are many different practices that contribute to conservation biological control, but little is known about their complementarity. We tested the effects of providing food and alternative hosts parasitoids by intercropping a plum orchard with companion plants. Oats vetch were intercropped into either as single-species (oats or vetch) two-species combined) intercrops within an inter-row. The...

The excessive use of fertilizer has resulted in serious environmental degradation and a high health cost China. Understanding the reasons for overuse is critical to sustainable development Chinese agriculture, large-scale operation considered as one measures deal with use. Under premise fully considering resource endowment heterogeneity farmers small-scale production management, different decis...

leach into groundwater after crop harvest in the fall, and depending on the species, can sequester atmospheric C Biculture legume–cereal cover cropping may enhance aboveand and/or N, thereby reducing the amount of N fertilizer belowground biomass yields and C and N contents. The increase in C and N supply to the soil has the potential to improve soil quality required for summer crops (Hargrove,...