Effect of different P sources and K levels on scheduling irrigation for a new introduced sunflower genotype.

Book Title: NA
Year Published: 2004
Month Published: NA
Author: El-Samanody, M. K. M. ; El-Marsafawy, S. M. ; El-Mohandes,S. I.
Book Group Author: NA

A field experiment was conducted in Giza, Egypt, during 2002 and 2003 to study the effects of irrigation based on various pan coefficients (1.4, 1.0 and 0.6, corresponding to I1, I2 and I3, respectively), P fertilizers (mineral and the biofertilizer Phosphoreen, corresponding to P1 and P2) and K rates (12.5, 25.0 and 37.5 kg/feddan, corresponding to K1, K2 and K3), on water relations, seed and oil yields, yield components, oil content, protein content, and fatty acid composition of sunflower (S53). The seasonal water consumptive use values were 40.95 and 43.57 cm in 2002 and 2003, respectively. The highest water use efficiency value was obtained when I1 was used with K1 and P2 in both years. The evaporation pan and Doorenbos-Pruitt formulae were superior to modified Penman and Penman Monteith formulae in calculating the potential evapotranspiration for sunflower in Middle Egypt (i.e. Giza region) because the former generated values that varied the least with the actual evapotranspiration values. Pooled results indicated that plant height, leaf area index, seed weight per plant, 100-seed weight, seed yield, and biological yield/feddan significantly increased by increasing the available soil moisture before irrigation time (1.4 pan evaporation coefficient). Phosphoreen was generally superior to calcium superphosphate. The differences between K levels were negligible. The highest seed yield (1128 kg/feddan) was obtained with I1 + P2 + K3. The interaction I3 × P2 × K2 gave the maximum seed oil percentage, while I1 × P2 × K1 gave the highest protein content. I1 × P2 × K3 resulted in the highest oil yield. The minor fatty acids were palmitic, stearic, linolenic and behenic acids, while the main fatty acids were oleic and linoleic acids (35.59-35.74 and 49.23-49.35%, respectively). I1 registered the highest sunflower yield; however, from the economic point of view, T2 is optimum with regard to yield and water use. P2 and K1 were the optimum P and K fertilizer resources. [1 feddan=0.42 ha].

Pages: 949 - 974
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20063119229&site=ehost-live
Volume: 42
Number: 3
Journal: Annals of Agricultural Science, Moshtohor
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 1110-0419

application rates, chemical composition, crop quality, cropyield, evapotranspiration, fatty acids, irrigation, irrigationscheduling, leaf area index, linoleic acid, linolenic acid, oleic acid,palmitic acid, phosphorus fertilizers, plant composition, plant height,plant water relations, potassium fertilizers, protein content, seedweight, seeds, stearic acid, sunflowers, superphosphate, water useefficiency, yield components, Egypt, Helianthus annuus, North Africa,Africa, Mediterranean Region, Middle East, Developing Countries,Helianthus, Asteraceae, Asterales, dicotyledons, angiosperms,Spermatophyta, plants, biofertilizers, phosphorus solubilizing bacteria,watering, LAI, hexadecanoic acid, phosphate fertilizers, chemicalconstituents of plants, potash fertilizers, octadecanoic acid, FieldCrops (FF005) (New March 2000), Plant Water Relations (FF062), PlantProduction (FF100), Fertilizers and other Amendments (JJ700), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revi

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