Nutrient depletion is one of the major causes that contribute to decline in soil productivity in the highlands of Ethiopia. It is generally a reversible constraint as long as soil test based fertilizer application is in place. However, Ethiopian subsistence agriculture has suffered for years due to lack of proper knowledge to combat nutrient depletion. To date, blanket application is the tradit...

From this equation the value of n is easily found. In a similar manner the values of p and k are found. The value of A is then found by substitution of the known values of n, p and k in (8). Equation (4) is then available for calculating the yield to be expected from any amounts of nitrogen, phosphoric acid and potash applied as fertilizers. This matter will be presented in detail in a paper so...

This experiment was laid out in order to evaluate the effects  of different biofertilizers on yield components of barley. The experiment was a factorial design with three replications. Treatments were three nitrogen biofrtilizers (Nitroksin, Nitrokara and Supernitroplass) and three phosphate  biofrtilizers (Phosphate barvar2, Biozarr and Superplass) with control for them and yield components we...

Organic waste materials are being used in huge amounts (tons ha) for improving soil health and crop yields. Recycling of organic wastes enriched with nitrogen and L-tryptophan (L-TRP) could convert organic waste material into a useful soil amendment, which may be effective even when added in substantially small amounts (kg ha). Organic waste material of fruits and vegetables was collected and s...

The increasing concern about environmental contamination by nitrate leaching from agricultural land has stimulated a search for more efficient ways to apply N fertilizers. An experiment was carried out to compare the effectiveness of foliar and soil N applications on apple tree growth and soil nitrogen status in order to evaluate N use efficiency. One-year-old, uniform Gala/M9 apple trees were ...

Israel is a small country with a total land area of 21,000 km, from which 20% is arable land. More than half of Israel has an arid to semi-arid climate. Approximately half of the cultivated area (200,000 hectares) has to be irrigated due to lack of rainfall and other water resources. Approximately 80% of the irrigated land in Israel uses the fertigation method, combining the application of wate...

A two-year experiment was conducted in the field to measure the combined impact of tilling and N fertilization on various agronomic traits related to nitrogen (N) use efficiency and to grain yield in maize cultivated in the presence of a cover crop. Four years after conversion to no-till, a significant increase in N use efficiency N harvest index, N remobilization and N remobilization efficienc...

• The abundance of N-cycling genes differently responded to NPK application. Chemical application greatly altered the microbial community structure. Soil acidification was main driver for variation in community. Manure addition beneficial stabilizing Straw and manure are widely applied agricultural systems, shape soil microflora. However, we still lack a comprehensive understanding how these or...