use of nitrogen fertilizers has contributed much to the remarkable increase in food production that has occurred during the past 50 years. however, environmental and economic challenges due to nitrogen application in agricultural have increased regard to nitrogen use efficiency (nue). studies conducted around the world shows that only half of nitrogen fertilizer inputs is taken up by crops. unf...

In Lebanon, potato occupies a surface of 14,800 ha corresponding to 17% of the irrigated land. The Bekaa valley is the largest production area in the country, with more than 67% of total potato production located on prime land. This crop is generally fertilized by soil application and irrigated by sprinklers with rare implementation of drip systems. Spring and summer potatoes depend entirely on...

The authors carried out long-term research on the effect of mineral fertilizers “Gala” potato variety in Pavlodar region. relationship was established between nitrogen, phosphorus and potassium chemical composition plant certain phases growth development. Various biochemical processes occur soil plants every second. productivity (y) depends how take place proceed, since it is a function (x) lea...

We investigated the variation in leaf nitrogen to phosphorus ratios of tropical tree and liana seedlings as a function of the relative growth rate, whole-plant water-use efficiency, soil water content and fertilizer addition. First, seedlings of 13 tree and liana species were grown individually in 38-l pots prepared with a homogeneous soil mixture. Second, seedlings of three tree species were g...

EXTENDED ABSTRACT The method of new NKSMg fertilizer based on utilization of feather waste from slaughterhouses was presented. The method allows the production of liquid fertilizers which can be used in soil and foliar application. The whole process is based on the digestion of feather waste by acid hydrolysis, adjusting pH of the reaction medium, and then enriched in selected nutrients. Pot ex...

Food production requires application of fertilizers containing phosphorus, nitrogen and potassium on agricultural fields in order to sustain crop yields. However modern agriculture is dependent on phosphorus derived from phosphate rock, which is a non-renewable resource and current global reserves may be depleted in 50–100 years. While phosphorus demand is projected to increase, the expected gl...

this fertility experiment was carried out using split plots based on a randomized complete block design of three replications in 2006 at sari agricultural sciences and natural resources university. the aim of the experiment was to investigate some macronutrient and micronutrient accumulation in leaves of different soybean cultivars as influenced by some organic fertilizer types and levels. main...

This study aimed to produce high-nitrogen compost extract and applicate it land plants microalgae, a candidate crop for biofuel high value-added material production, as part of low-salinity production system. For this purpose, we selected komatsuna, leafy vegetable, Botryococcus braunii, microalga, the test species. Nitrogen-added compost, which was used deodorizing ammonia released from compos...

in order to investigation the effect of different fertilization treatments on nutrient and essential oil contents in dragonhead drug (dracocephalum moldavica l.), an experiment was conducted in the station of agricultural research in urmia on 2008. treatments (nitroxin, barvar phosphate biofertilizer, biosulfur, nitroxin+ barvar phosphate biofertilizer, barvar phosphate biofertilizer + biosulfu...