@article { author = {}, title = {The Influence of Preceding Crops and Intercropping Maize with Cowpea on Productivity and Associated Weeds}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {1-18}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.146}, abstract = {TWO FIELD experiments were carried out at Mallawi Agric. Res. St. (Middle Egypt) during the two summer seasons of 2008 and 2009. The objectives of this study were to investigate the effect of preceding crops and intercropping maize with cowpea on productivity and associated weeds. A randomized complete block design (RCBD) in a split plot arrangement with three replications was used in both seasons. The main plots were devoted to the three preceding winter crops (wheat, faba bean and berseem) while sub plots were allocated for three solid planting namely solid maize, solid cowpea cut two months (forage) and solid cowpea left without cutting (seeds), as well as two intercropping treatments namely: maize + cowpea cut after two months (forage) and maize + cowpea left without cutting (seeds). The results showed that maize preceded by faba bean was superior in most studied characters while the lowest values were observed when it grew after wheat. The weed density in maize sequenced by legume crops was less than this grown in maize sequenced by wheat.The yield and yield components of maize were decreased under intercropping conditions. The lowest values were observed when cowpea (forage) was preceded by wheat. The reduction in maize grain yield when intercropping with cowpea was 4.7% (combination of the two seasons). The reduction in weed weight was 72.8% when intercropped cowpea was forage and 72.0% when cowpea was seeds compared with solid planting. The forage and seeds yield of cowpea were more decreased under intercropping condition. The reduction in forage and seeds yield were 52.2 and 74.3% compared with solid planting, respectively. The highest values of land equivalent ratio (LER) (1.46), area time equivalent ratio (ATAR) (1.19) and monetary advantage index (MAI) (1874.66) were observed when sequenced by berseem and intercropped cowpea with cut after two months.}, keywords = {Sequence crops,Intercropping,legume,Cereal Weed control}, url = {https://agro.journals.ekb.eg/article_146.html}, eprint = {https://agro.journals.ekb.eg/article_146_18b667a3e95a4f7ad11663742350b104.pdf} } @article { author = {}, title = {Response of Hybrid Rice to Time and Method of Potassium Application}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {19-33}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.147}, abstract = {TWO FIELD experiments were carried out at the experimental farm of the Rice Research and Training Center, Sakha, Kafrelshiekh, Egypt, during 2009 and 2010 seasons, to study the response of hybrid rice (Egyptian Hybrid1) to methods (soil addition and foliar spray (S)) and time of potassium application. Eleven combinations were studied as follow applications times: (T1) without k fertilizer , (T2) 24+0+0, (T3) 8+8+8, (T4) 8+8+S, (T5) 12+12+S, (T6) 8+ S +S, (T7) 12+ S +S, (T8) 24+ S +S, (T9) 0+ S +0, (T10) 0+ 0 +S and (T11) 0+ S +S kg K2O/fed. (feddan = 0.42 hectare) at basal (B), med tillering (MT) and panicle initiation (PI) stages, respectively, as well as (11) without K fertilizer. The results revealed that basal application of K or foliar spray twice each at MT and PI stages resulted in a significant increase in plant height and dry matter accumulation (g.m-2) compared with control in both seasons. Soil or foliar application of K, separately or together, resulted in a significant increase in number of panicles m-2, panicle weight, panicle length, number of filled grains per panicle, 1000-grain weight, grain yield and nutrients uptake (N, P, K and Zn) in grains compared with control treatment in both seasons. Split application of 24 kg K2O/fed in three equal doses was found to better grain yield, yield attributes and nutrients uptake in grains than entire basal application or foliar spray at MT or PI stages alone. The integration of basal application and either top dressing or foliar K in MT and PI stages did not differ from splitting K in three equal doses in the most mentioned traits in both seasons. However, basal application of 24 kg K2O/fed alone or along with foliar spray at MT and PI produced the highest straw yield and nutrients uptake (N, P, K and Zn) in straw in the two seasons. There was no significant difference in straw yield among foliar application of potassium and control treatment. The treatment containing soil application of K twice at basal and MT stage, or entire basal application alone were insignificant with entire basal along with the foliar application of K at MT and PI stages in N, P, K and Zn uptake in straw in both seasons. The correlation among each of nutrient content and grain and straw yields were significantly positive. The present study concludes that splitting 24 kg K2O/fed in three equal doses, i.e. 8+8+8 or the combination of top dressing (kg K2O/fed) and foliar spray (S), 8+8+S, 12+S+S and 8+S+S at basal, MT, and PI stages are a viable nutrient management package for getting higher grain yield of hybrid rice (Egyptian Hybrid1) at Kafrelshiekh Governorate.}, keywords = {}, url = {https://agro.journals.ekb.eg/article_147.html}, eprint = {https://agro.journals.ekb.eg/article_147_e5e418ee22168b85e0c569f98b808dda.pdf} } @article { author = {}, title = {Effect of Cowpea Intercropping Date in Maize and Sorghum Fields on Productivity and Infestation Weed}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {35-49}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.148}, abstract = {TWO FIELD experiments were carried out at Malawi Agricultural Research Station, Minia Governorate, Egypt during 2008 and 2009 summer seasons, to study the effect of cowpea intercropping date on maize (the first one) and sorghum (the second one) on productivity and associated weeds. Three intercropping dates of cowpea with maize or sorghum were three weeks preceding (D1), synchronized plantation (D2) and post maize or sorghum plantation with three weeks (D3) as well as the solid plantation of the three crops. The results indicated that cowpea intercropping date significantly affected plant heights of either maize or sorghum. The preceding cowpea intercropping (D1) significantly decreased maize and sorghum plant height while neither (D2) nor (D3) had shown significant effects on plant height. The grain yields of both maize and sorghum were remarkedly reduced by 50.4 and 36.6% with preceding cowpea intercropping, respectively, while the post plantation cowpea intercropping (D3) tended to insignificant increase the grain yield of maize or sorghum. Effective reduction reached 90% and 93.7% of weed biomass when maize and sorghum were intercropped with cowpea at the same time (D2), respectively. The post plantation cowpea intercropping with maize and sorghum caused less weed biomass reductions reached 65.5% and 80.6%, respectively. Green forage yield of cowpea overall cuts was decreased as the results of post plantation cowpea intercropping (D3) than the other two dates (D1 and D2). The reduction was 63.4 and 70.2% when cowpea as compared with solid cropping of cowpea was intercropped with maize and sorghum, respectively, while, the reduction diminished to 27.5% and 32.4% when the preceding cropping of maize and sorghum was applied. Maize and sorghum were the dominant crops, whereas cowpea was the dominated one. The highest land equivalent ratios recorded 1.4 when cowpea intercropped three weeks after maize (D3) and 1.5 for synchronized cowpea intercropping (D2) with maize and sorghum, respectively. The most benefit realized was associated with post plantation cowpea intercropped with maize expressed as monetary index of 1840.63. The total actual yield loss was negative in the three intercropping dates with maize or sorghum which decrease in yield of these crops compared with solid state. It could be concluded that synchronized cowpea intercropping (D2) with maize and sorghum is the most profitable and preferred for reducing weed infestation.}, keywords = {Intercropping,Cowpea,Sorghum,Maize}, url = {https://agro.journals.ekb.eg/article_148.html}, eprint = {https://agro.journals.ekb.eg/article_148_25b51c29df76eece00b6c2261fbce946.pdf} } @article { author = {}, title = {Relay Intercropping of Cotton with Wheat in Reclaimed Land}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {51-65}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.149}, abstract = {A FIELD trial was carried out at the Nubaria Agricultural Research Station, Egypt during 2007/2008 and 2008/2009 seasons to study the effect of relay intercropping of cotton (Gossypium barbadense L.) with wheat ( Triticum aestivum L.) at different sowing dates of cotton (1st of March, 15th of March and 1st of April) and three different varieties of wheat (Gemmiza 7, Sakha 93 and Giza 168) on growth, yield and yield, components of both crops. Results indicated that all intercropping treatments showed yield advantage compared with solid planting. The maximum value of land equivalent ratio (LER) were 1.97 and 1.88 in the first and second season, respectively, and area time equivalent ratio (ATER) were 1.16 and 1.10 in the two seasons respectively were recorded when cotton was planted at date 15th March through relay intercropping with wheat variety cv Sakha 93. The yield and yield components of wheat were affected significantly by different varieties of wheat. The highest wheat yield was obtained when wheat cv. Giza 168 was relayed on cotton at 1th March whereas, the lowest value was obtained when wheat cv. Gemmiza 7 was relayed intercropped with cotton at late date (1st April). The yield and yield components of cotton were affected significantly by planting date of cotton. The highest cotton yield was produced when wheat cv Sakha 93 relayed intercropped with cotton at 15th March whereas, the lowest value was recorded when wheat cv. Gemmiza 7 was intercropped with cotton atlatest date (1st April). The total income was the highest when relayingintercropping wheat cv. Giza 168 were grown with cotton at (15th March). It could be concluded that relay intercropping of cotton with wheat as intensive cropping system is recommended to increase the productivity of the unit area.}, keywords = {Intercropping,planting dates,Wheat,Cotton,land equivalent ratio}, url = {https://agro.journals.ekb.eg/article_149.html}, eprint = {https://agro.journals.ekb.eg/article_149_39bd7d0219ff7117ebfefcc774f5db99.pdf} } @article { author = {}, title = {Effect of Magnesium Sulphate and Copper Sulphate Foliar Application on Wheat under Sandy Soil Conditions}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {67-81}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.150}, abstract = {TWO FIELD experiments were conducted at Ismailia Exp. Sta., Agric. Res. Centre, Egypt, in 2007/2008 and 2008/2009 seasons to study the effect of foliar application of copper sulphate (CuSO4) and magnesium sulphate (Mg) on growth, yield and grain quality of wheat ( Triticum aestivum L. cv. Sakha 94) under sandy soil conditions. The results indicated that foliar application of 6.72 kg MgSO4 + 1.68 kg CuSO4/fed produced the highest values of growth attributes such as plant height, tillers/m2, flag leaf area, chlorophyll contents and dry matter/m2. The highest positive significant effects on spike/m2, spike length, no. of grains/spike, grains weight/spike, 1000-grains weight, grain yield/fed and straw yield/fed were achieved by spraying copper sulphate and magnesium sulphate treatments. The highest increment in grain yield was obtained by spraying wheat plants by 1.68 kg CuSO4/fed. Results also showed that the most of both macro and micronutrients content in wheat shoot increased markedly due to spraying wheat plants with 6.72 kg MgSO4 + 1.68 kg CuSO4/fed. On the other hand, the highest wheat grains content of protein, N, Mg, Cu and Zn contents (15.45 %, 2.65 %, 0.35 %, 7.90 ppm and 54.40 ppm, respectively) were achieved with spraying wheat plants by 6.72 kg MgSO4 + 1.68 kg CuSO4/fed. However, spraying wheat plants with 0.84 kg CuSO4/fed gave the highest grain carbohydrate percentage (69.33 %). Spraying wheat plants with 6.72 kg MgSO4 + 1.68 kg CuSO4/fed gave the highest magnesium, copper and Zn content (0.28 %, 3.80 ppm and 46.20 ppm, respectively) in wheat straw as compared with unsprayed plants. The correlation coefficient between wheat yield and number of spike/m2, 1000-grains weight and harvest index was highly positive significant (0.953**, 0.895** and 0.826**, respectively) under this conditions.}, keywords = {Wheat,Triticum aestivum L,Magnesium sulphate,Copper sulphate,foliar application,yield,Quality,sandy soil}, url = {https://agro.journals.ekb.eg/article_150.html}, eprint = {https://agro.journals.ekb.eg/article_150_3042346d11927a3c17a0a825c8dc94a7.pdf} } @article { author = {}, title = {Predicting Impacts of Climate Change on Maize Productivity in Egypt}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {83-94}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.151}, abstract = {THE POTENTIAL effects of climatic change impose great challenges on agriculture scientists to diminish expected detrimental consequences of global warming. Two available databases, with results and observations of the last ten full seasons from 1997 to 2006 of maize national campaign and meteorological records of the same period databases were used to establish preliminary models illustrating climatic factors affecting maize grain yield. Five models were restricted for maize hybrids, i.e. SC.10, SC.155, TWC.324 and Nefertity hybrid in addition to a general model for maize hybrids deduced from an average performance of 20 maize hybrids either single or three way crosses. Data of grain maize yield production were collected by scientific teams who monitored demonstration fields distributed over 17 governorates during 10 years, where the recommended technological package was accurately executed. The polynomial models that deduced depending on growing degree days (GDD) and their base temperatures as well as air relative humidity (ARH) illustrated at least 99% of the variance in the maize productivity over governorates and years. Forecasting the potential impact of climate changes on maize grain yield under some scenarios of global warming predicted slightly decrease due to temperature increase and low ARH percentage. Maize grain yield productivity will be slightly declined in some governorates as Aswan. By contrast, ARH increments give quite satisfactory relief effects from heat increasing.}, keywords = {Maize,Climate Change,Multiple regression,Predict}, url = {https://agro.journals.ekb.eg/article_151.html}, eprint = {https://agro.journals.ekb.eg/article_151_62ceed3b5ace3efe5a5da854da863464.pdf} } @article { author = {}, title = {Studies on Cassava ( Manihot esculenta Crantz) Intercropped with Fodder Cowpea ( Vigna sinensis L.) in Sandy Soil}, journal = {Egyptian Journal of Agronomy}, volume = {33}, number = {1}, pages = {95-111}, year = {2011}, publisher = {National Information and Documentation Center (NIDOC), Academy of Scientific Research and Technology}, issn = {0379-3575}, eissn = {2357-0288}, doi = {10.21608/agro.2011.152}, abstract = {FIELD trials were carried out in a newly reclaimed sandy soil at South Tahrir Research Station, during 2008/2009 and 2009/2010 seasons to study the response of intercropping fodder cowpea (Vignaunguiculata L.) with cassava (Manihot esculenta Crantz) at different plant spacing of cassava (1.0m x1.5m, 1.0m x1.0m and 1.0m x 0.75 m) and three plant density of fodder cowpea (21000, 28000 and 42000 plants/fed) on growth, yield and yield components of both crops. Asplit-plot design was used with three replicates. The effect of cassava plant spacing indicated that maximum yield of cassava tubers was associated with lowest cassava spacing (1.0 m x 0.75 m) associated with highest cowpea plant density (42000 plants/fed) in both seasons. Whereas, the maximum yield of cowpea forage yield was observed when fodder cowpea was intercropped with cassava under highest cassava plant spacing (1.0 m x1.5 m) associated with the highest plantdensity of cowpea (42000 plants/fed) in the two seasons. Maximumvalue of land equivalent ratio (LER) 1.66 and 1.70 wasrecorded when cassava was planted at 1.0 m x 0.75 m intercropped with cowpea at highest population density (42000 plants/fed) in the two seasons. Cassava was the dominated crop when intercropped with cowpea in most cases.}, keywords = {Intercropping,Plant spaces,Cassava,( Manihot esculenta Crantz),Fodder cowpea ( Vigna unguiculata L.),Land equivalent ratio (LER)}, url = {https://agro.journals.ekb.eg/article_152.html}, eprint = {https://agro.journals.ekb.eg/article_152_d4b59c73148cd7c0cb1e65ce638b7c1e.pdf} }