A TWO-year field experiment was carried out at El-Serw Agricultural Research Station, during the 2018 and 2019 seasons to study the effect of intercropping cowpea (Vigna unguiculata L.) with three maize (Zea mays L) hybrids (SC 168, SC176 and TWC 321) and four N fertilization treatments (120kg N/fed as urea (100% N mineral), 50% N mineral + 50% N nano, 75% N mineral + 25% N nano and 3.0cm 3 N nano/ L (100% N nano) on maize and cowpea productivity, land use efficiency and economic return. A split-plot design with three replicates was used. Results showed that maize hybrids had significant effect on yield and yield attributes of maize and cowpea in both seasons, with some exception. The S.C.168 hybrid gave the highest grain yield and its components, while intercropping cowpea with S.C.176 hybrid significantly increased yield and its attributes of cowpea in comparison with other hybrids. Applying 75% N mineral along with 25% N nano significantly increased growth, yield and yield components of maize and cowpea in both seasons. Significantly increase in yield and its attributes of maize and cowpea was realized by interaction between maize SC168 and 75% N mineral +25% N nano fertilization. Intercropping cowpea with maize SC168 that received 75% of the N mineral + 25% nano fertilizer recorded the highest LER 1.67 and 1.66, ATER 1.59 and 1.58, Aggressivity 0.28 and 0.23, gross return15865 and 15854 L.E./fed and net return 7983 and 7972L.E./fed in first and second seasons, respectively, as well as rationalizing the use of N mineral fertilizers.

Two field experiments were carried out at the Experimental Farm of Sakha Agricultural Research Station, Agricultural Research Center Egypt, during the two successive summer seasons of 2011 and 2012. The main objectives of this study were to determine the effect of tillage treatments, plant distribution patterns and sources of nitrogen fertilizer on growth, yield and its components of corn hybrid S.C. 128. Each tillage treatment was performed in separate experiment. Every experiment of tillage treatment was carried out in split plot design with four replications. The main plots were occupied with plant distribution patterns. The sub-plots were assigned to sources of nitrogen fertilizer. The most important results could be summarized as follaws: All studied characters were significantly affected by different studied tillage treatments in the two seasons. Using chisel plow twice gave the highest values of studied characters in both seasons. Using chisel plow once in addition to Stiller plow once was accompanied with the least values of these characters in both seasons. There was significant effect on all studied characters due to plant distribution patterns in the two seasons. Planting maize in ridges 80 cm apart, 22 cm between hills and one plant per hill produced the highest values of all studied characters in both seasons. Planting corn or maize in ridges 70 cm apart, 50 cm between hills and two plants per hill gave the lowest values of these characters in both seasons. Sources of nitrogen fertilizer had a significant effect on all studied characters in the two seasons. Using Urea fertilizer resulted in the highest means of all studied characters followed by using Ammonium Nitrate then Ammonium Sulphate fertilizers in both seasons. It can be concluded that tillage corn soil by using chisel plow twice and planting in ridges 80 cm apart, 22 cm between hills and one plant per hill in addition using Urea as a source of nitrogen fertilizer in order to maximize corn hybrid S.C.128 growth and its productivity under the environmental conditions of Sakha district,Kafr El-Shikh Governorate Egypt.

This research was done to evaluate the growth and yield of potato plants raised from seed tuber pieces (STP) containing one, two, three and four eyes, for ascertaining whether seed tuber pieces containing two eyes will sustain potato growth and yield indifferently from those of larger seed tuber pieces containing more eyes. Results indicated that number of stolons and leaves per plant, leaf area, plant fresh and dry weight, relative growth rate, net assimilation rate, crop growth rate, chlorophyll a, b as well as total chlorophylls, Number of tubers and total tuber yield per plant were decreased with decreasing number of eyes in the STP. However, final emergence percentage and total carotenoids content were not significantly affected. Nevertheless, number of tubers and total tuber yield per plant did not differ significantly neither between whole seed tubers and half seed tubers containing four eyes nor half STP containing three eyes and quarter STP containing two eyes. However, all these parameters were significantly lower in response to single-eye STP compared with those containing two eyes or more. From the economic point of view, cultivation of quarter STP containing two eyes instead of half STP containing four eyes represents 50 % conservation in the seed tubers used for only 13.5 % loss in tubers yield. So, it could be concluded that the gain in net income became substantiated by cultivation of quarter STP containing at least two eyes instead of larger seed tuber pieces, even that represents half of the seed tuber.

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