the aim of this study was to determine the effects of ensiling and using of fertilizers nitrogen and phosphorus on chemical composition and ruminal dm degradability of safflower plant (carthamustinctorius l.). the safflower plant was cultivated at december 2009, and harvested at june 2010 in flowering stage, chopped to 3-5 cm particles and then ensiled in the laboratory silos for 60 days. the e...

Variable fertilization for crops, like corn, depends on monitoring nutrition condition. Thus, hyperspectral reflectance was used to predict chlorophyll and total nitrogen content under different N,K treatments during corn growth. The area of the experimental field was divided into 3 strips with different nitrogen treatment (N1:0 kg/ha–low, N2:314 kg/ha–normal, and N3:653 kg/ha–high). In each st...

the objective of this experiment was to determine the effects of different levels of nitrogen (n) and salinity on biochemical mechanisms of two wheat genotypes. a field experiment was carried out in a three replicate rcbd split factorial experiment in salinity station of college of agriculture, ferdowsi university of mashhad, iran in 2007-2008 and 2008-2009. three levels of salt stress (1.3, 5,...

Sustainable soil and crop management practices that reduce soil erosion and nitrogen (N) leaching, conserve soil organic matter, and optimize otton and sorghum yields still remain a challenge. We examined the influence of three tillage practices (no-till, strip till and chisel till), four cover rops {legume [hairy vetch (Vicia villosa Roth)], nonlegume [rye (Secaele cereale L.)], vetch/rye bicu...

The decline in soil fertility and poor weed management are the dominant limitation on production of maize Nigeria. Improving efficiency fertilizers through AMF inoculation atrazine application may be a sustainable way to increase land productivity. Using completely randomised design with three replications, combinations Organomineral Fertilizer (OF) at 0, 50, 100, 150 kg N/ha- NPK 15-15-15 (400...

Nitrogen is one of the most important factor affecting maize (Zea mays L.) yield and income of smallholders under semiarid climates. Field experiments were conducted to investigate the impact of different N-fertilizer sources [urea, calcium ammonium nitrate (CAN), and ammonium sulfate (AS)] and rates (50, 100, 150, and 200 kg ha-1) on umber of rows ear-1 (NOR ear-1), number of seeds row-1 (NOS ...

A split plot 3 by 4 experiment was designed to examine the impact of 15-week variable levels of nitrogen fertilization (0, 90, 180 and 270 kg N/ha) on the characteristics of total flavonoids (TF), total phenolics (TP), total non structurable carbohydrate (TNC), net assimilation rate, leaf chlorophyll content, carbon to nitrogen ratio (C/N), phenyl alanine lyase activity (PAL) and protein conten...

Ž . y Nitrogen N in surface waters has been linked to agricultural crop production, and more specifically, to NO exported 3 Ž by tile drainage. The objective of this study was to evaluate agricultural N pools and fluxes in a seed cornrsoybean Zea . Ž . y maize L.rGlycine max L. watershed 40 ha to relate soil inorganic N pools with annual losses of NO in drainage tiles. 3 During a 2-year period ...

Urban ecosystems are rapidly expanding and their effects on atmospheric nitrous oxide (N2O) inventories are unknown. Our objectives were to: (i) measure the magnitude, seasonal patterns, and annual emissions of N2O in turfgrass; (ii) evaluate effects of fertilization with a high and low rate of urea N; and (iii) evaluate effects of urea and ammonium sulfate on N2O emissions in turfgrass. Nitrog...