Phosphorus (P) fertilizer recommendations in most European countries are based on plant-available soil P contents and long-term field experiments. Site-specific conditions are often neglected, resulting in excessive P fertilizer applications. P fertilization experiments including relevant site and soil parameters were evaluated in order to analyze the yield response. The database comprises abou...

Excessive nitrogen (N) fertilizer input has become a common phenomenon among most farmers in the winter wheat–summer maize rotation system of north-central China, and resulted low nutrient use efficiency environmental pollution. Controlled-release urea (CRU) is proposed as solution to excessive fertilization because CRU achieves high yields reduces N losses. Therefore, mixed with normal at rate...

Nitrogen (N) fertilization reduces worldwide food insecurity by boosting crop yield and stability. N is one of the most essential macromolecules required for growth reproduction plants. It occurs in diverse chemical forms circulates natural agricultural ecosystems. a constituent chlorophyll, hence photosynthesis Plants receive through their roots form ammonia or nitrate. Nutritional quality def...

Nitrogen (N) is an essential plant nutrient, therefore, N-deficient soils affect growth and development. The excessive unwise application of N fertilizers result in nutrient losses lower use efficiency that leads to the low crop productivity. Ammonia volatilization causes a major loss after fertilization environmental pollution. This experiment was conducted evaluate effectiveness coating uncoa...

In paddy fields, overuse of nitrogen fertilizer to maximize yields can lead excessive economic loss and degradation the environment. Therefore, studying effects urea–chitosan nanohybrid as a slow released source on rice cultivation was aim our study. The fertilization applications, namely: CU: control treatment; U1: application full recommended dose classical urea (165 kg N ha−1); U2: adding by...

shoot:root ratio, dry matter partitioning, growth analysis, and water use efficiency of oat (avena sativa l., cv. walker) was investigated under excessive nitrogen (n) as 200 mg n kg-1 (n1p0), excessive phosphorus as 200 mg p kg-1 (n0p1), and combined 100 mg n+100 mg p kg-1 (n2p2), and the control (n0p0) as check in a pot experiment at dryland agriculture institute, west texas a and m universit...

in order to do in vitro fertilization (ivf), 435 oocytes were collected from 20 super ovulated nmri female mice, in m2 media with 4% bsa. 85% (n=370) of collected oocytes were in mii phase. epididymal sperms were added to 332 oocytes in t6 media drops with 4% bsa and incubated. fertilization rate was 79.8% (n=265) out of which 27.5% (n=73) grew to morula and 20.8% (n=55) achieved blastocyst sta...

this study was conducted to determine the effects of different water and nitrogen application levels on drip-irrigated tomato plants. the amount of water usage was based upon the pan evaporation from a screened (class “a”) evaporation pan. the treatments consisted of two irrigation intervals (i1= 5 days and i2= 10 days), three plant-pan coefficients (kcp1= 0.50; kcp2= 0.75 and kcp3= 1.00) and t...

Background: The conventional fertilization regime ignores the allometric characteristics of Quercus nuttallii seedlings, challenging them to meet nutritional needs at each growth stage. This study was conducted determine impact exponential on and nutrient status Q. container seedlings. Methods: Two regimes (average/exponential) were performed varied gradients (0, 300, 500, 700, 900 mg/seedling)...

Nitrogen addition to soil can play a vital role in influencing the losses of soil carbon by respiration in N-deficient terrestrial ecosystems. The aim of this study was to clarify the effects of different levels of nitrogen fertilization (HN, 200 kg N ha year; MN, 100 kg N ha year; LN, 50 kg N ha year) on soil respiration compared with non-fertilization (CK, 0 kg N ha year), from July 2007 to S...