Effect of (Halex-2) Biofertilizer Inoculation on Cowpea Yield and Mineral Fertilizer-N Optimization

Abstract

A field experiment was conduced during the summer seasons of 2005 and 2006 at Disuq district, Kafr El-Sheikh Governorate to study the combined effect of inoculation with Halex-2 (as biofertilizer) and mineral nitrogen levels on cowpea yield and their net return.Split plot design was used with four replicates. The main plots were assigned by two treatments of uninoculated (control), and inoculated with Halex-2. Whereas, the sub-plots were assigned by five N levels (0, 10, 20, 30 and 40 kg N fed -1 ). Four polynomial quadratic equations were established to show the following results:1. The maximum and optimum N rates were decreased as Halex-2 used in the two seasons. 2. The maximum and optimum cowpea yields were increased as Halex-2 used in the two seasons. 3. The highest maximum yield (1413.2 kg fed -1 ), the highest total value of yield (7065.0 L.E fed -1 ) and the highest return of bio and N fertilizer (2936.6 LE fed -1 ) were obtained as Halex-2 used in the first season. 4. The average of efficiency and the efficiency of nitrogen fertilizer at optimum rate were increased as Halex-2 used. 5. The soil nitrogen content during plant growth (Xs) was increased as Halex-2 added. 6. The contribution of soil N was increased as Halex-2 used in the two seasons. 7. The contribution of N fertilizer was increased as N levels increased in the two seasons.

Effect of Irrigation Water Amounts and Nitrogen Rates, on Cucumber Optimum Yield and Net Return, Under Drip Irrigation at Northwest Delta, Egypt

“…Thabet and Balba (1994) obtained similar results, where they stated that the contribution of N fertilizer to the rice grain yields increased with the increase of fertilizer N application under different levels of tillage, and the contribution of soil N to the rice grain yields decreased with the increase in the fertilizer N application under different levels of tillage. The results are in agreement with those obtained by Atia (2005), Atia et al (2007) and Atia et al (2009).…”

“…These results reflect the effect of irrigation water amount on plant growth, where its increase increased the surface area per unit root length and enhanced root hair branching with an eventual increase in the uptake of nutrients from the soil and vice versa. The results are in agreement with those obtained by Thabet and Balba (1994), Atia (2005) , Atia et al (2007) and Atia et al (2009) who stated that the efficiency of nitrogen fertilizer had decreased with increasing N fertilizer levels.…”

“…The expected yield when this optimum rate is applied, and the obtainable yield at specified rate of fertilizer application can also be predicted (Balba, 1987). Many investigators have used the quantitative approach to evaluate and quantitatively express the response of crops yield to nitrogen fertilizer, Thabet and Balba (1994), El-Shebiny and Badr (1998), Atia ( 2005), Atia et al ( 2009).…”

Response of Some Wheat Varieties to Nitrogen Fertilization

“…The expected yield when this optimum rate is applied and the obtainable yield at specified rate of fertilizer application can also be predicted. Thabet and Balba (1994), Hassanein and El-Shebiny (2000), Atia (2005), Atia et al. (2009), Mashali et al (2011) and Atia et al (2012) calculate the net return of nitrogen applied to decrease the costs of added fertilizers at the minimum point.…”

Effect of Irrigation Water Amounts and Nitrogen Rates on Optimum Maize Yield and Net Return Under Drip Irrigation Systum at Northwest Delta, Egypt

“…This would then enable us to calculate the optimum rate of fertilizer application on which is of economical importance. The expected yield when this optimum rate is applied and the obtainable yield at specified rate of fertilizer application can also be predicted Thabet and Balba (1994), El Shebiny and Badr, (1998), Atia (2005), Atia et al (2007) and Atia et al (2009) were used the polynomial quadratic equations to calculate the net return from optimum rates of nitrogen applied and the contribution of soil and fertilizer nutrients to the yield.…”