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.
Highlights
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
All the studied traits of sunflower were not significantly affected by the interaction between cropping systems and N fertilizer type (Table 3). These results revealed that each of these two factors act independently on sunflower yield and yield components meaning that cropping systems responded to N fertilizer type for all the studied traits of sunflower
Application of urea form may improve rhizobia activity and increase soil N availability for cowpea growth and development under cropping systems (Ali et al, 2010). These results show that there was a positive significant effect (P ≤0.05) of interaction of cropping systems and N fertilizer type on forage yield of cowpea
Summary
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. The results indicated that insignificant effect of cropping systems was found for sunflower and significant effect was found for cowpea yield. Insignificant effect of interaction of cropping systems and N fertilizers was found for sunflower and significant effect was found for cowpea yield. Značilen učinek dušikovih gnojil na pridelek je bil ugotovljen pri sončnici in neznačilen pri vinji. Neznačilni učinek medsebojnega vpliva kolobarja in dušikovih gnojil je bil ugotovljen pri pridelku sončnice in značilen pri pridelku vinje. Značilni učinek dušikovih gnojil je bil ugotovljen pri pridelku pšenice in neznačilen pri pridelku graha. Indicated that intercropping cowpea with sunflower did not affect sunflower yield, but it increased land equivalent ratio to be close to 200 %. Land equivalent ratio is the ratio of area needed under sole cropping to one of intercropping at the same management level to produce an equivalent yield. Rodrigues (2011) stated that, in cowpea intercropping with sunflower system, the highest productivity of sunflower occurred when cowpea planting density was 25 %
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