Maximizing land productivity by diversified cropping systems with different nitrogen fertilizer types

Abstract

Six field experiments were conducted in Giza Agricultural Research Station, Egypt during 2010, 2011 and 2012 growing seasons to study the effect of two types of N fertilizers (urea and urea form as slow-release (UF)) on intercropping cowpea with sunflower and intercropping wheat with pea. A split plot design with three replications was used. The results indicated that insignificant effect of cropping systems was found for sunflower and significant effect was found for cowpea yield. Significant effect of N fertilizers was found on sunflower and insignificant effect was found for cowpea yield. Furthermore, insignificant effect of interaction of cropping systems and N fertilizers was found for sunflower and significant effect was found for cowpea yield. With respect to wheat and pea intercropping, both crops were significantly affected by intercropping system. Significant effect of N fertilizers was found on wheat and insignificant effect was found for pea yield. Both wheat and pea were significantly affected by the interaction of cropping system and N fertilizers. Yield advantage was achieved because land equivalent ratio exceeded 1.00. Dominance analysis proved that leguminous crop is dominated component. Thus, the studied intercropping systems could be recommended to farmers due to its beneficial returns.

Effect of Intercropping Onion with Sugar Beet on Productivity of Both Crops and Root-Knot Nematodes Control under Different Onion Plant Densities and Slow-Release N Fertilizer Rates

“…These increases due to mixing slowrelease nitrogen fertilizer may be attributed to minimizing the loss of nitrogen by leaching, retarded nitrification besides saving a suitable amount of nitrogen as plant need during the different stage life which increased growth and root yield was reflected on NUE. Similar finding was reported by Abdel-Wahab and El Manzlawy (2016), Zohry et al (2017). Dou and Alva (1998) found that the total N uptake by seedlings was higher for the controlled release fertilizers than conventional urea.…”

“…These results are in harmony with those obtained by Abdel-Wahab and El Manzlawy (2016) who found that decreasing wheat density from 6 to 4 rows intercropping with faba bean with increasing N slowrelease fertilizer to 238 kg/ha gradually increased LER. These results confirmed by Zohry et al (2017).…”

“…The negative result of control applied on NUE could be due to quick release of nitrogen fertilizer is lost easily from sandy soils, hence N availability did not satisfy onion requirement for growth and development. Urea formaldehyde as slow-release nitrogen fertilizer has many advantages over traditional urea, including a reduction in labour with a single basal application and higher nitrogen uptake efficiency by crops (Shoji and Gandeza, 1992;Zohry et al, 2017). It is also environment friendly in terms of reduction of fertilizer, N losses associated with leaching and denitrification (Ueno and Yamamuro, 1996).…”

“…It is also evident that intercropping onion with sugar beet under any plant density or N fertilizer rate exceeded the solid sugar beet. The greatest benefit of intercropping was increasing grower profits (Abdel Motagally and Metwally, 2014;Masri and Safina, 2015;Zohry et al, 2017).…”

Desarrollo del girasol (Helianthus annuus L.) con aplicación de codornaza bajo distintas láminas de riego

“…Por otro lado, el manejo de los fertilizantes es una parte indispensable de la agricultura y una de las inversiones más importantes en todo cultivo, esto se debe en parte al aumento de los costos, particularmente del fertilizante nitrogenado (Pibars et al, 2015;Zohry et al, 2017), ya que el nitrógeno es uno de los nutrientes minerales más importantes en la producción de cultivos (Zohry et al, 2017) y el que posee una mayor demanda en la agricultura (Figueiredo-Lobo & Grassi-Filho, 2009). El nitrógeno es fácilmente absorbido por las plantas en forma de nitrato (NO3), urea (CO(NH2)2) y amonio (NH 4+ ) (Ozturk et al, 2017).…”