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ÖZ, MEHMET

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    Publication
    Yield and economic return response of silage maize to different levels of irrigation water in a sub-humid zone
    (Lithuanian Research Centre Agriculture & Forestry, 2015-01-01) Karasu, Abdullah; KUŞÇU, HAYRETTİN; KARASU, ABDULLAH; ÖZ, MEHMET; Öz, Mehmet; Mustafakemalpaşa Meslek Yüksekokulu; 0000-0001-9443-3867; 0000-0001-9600-7685; S-5338-2018; AAH-1754-2021; AAH-4682-2021
    Field studies were conducted during the summers of 2007 and 2008 to determine the response of silage maize (Zea mays L.) to different levels of irrigation water to guide programs for the development of improved irrigation management practices for sub-humid zones. The experiments were carried out in Bursa, Marmara region, Turkey. Silage maize plants (cv. 'Ada-523') were subjected to different levels of irrigation using a drip system in the field on a clay-loam soil. Fully irrigated (FI = 100%) plants were irrigated at 100% pan evaporation (Epan) replenishment with 7-day intervals. In other treatments, irrigation was applied as excessive (EI = 125% Epan) and deficit (DI-75 = 75% Epan, DI-50 = 50% Epan, DI-25 = 25% Epan, NI no irrigation). Plant height, first ear height, stem diameter, number of ears per plant and net income decreased with decreases in the amount of irrigation, but the effect of soil water deficit on the number of leaves per plant and ear ratio in forage was minor. The highest forage yields were obtained with El (125% Epan), FI (100% Epan) and DI-75 (75% Epan) treatments. FT treatment produced the highest net income based forage yield. Severe soil water deficit substantially reduced forage yields and net income in both years. The results showed that full irrigation during the whole growing season is preferable for higher forage yield and net income. However, in regions of water scarcity, farmers should adopt the deficit irrigation (DI-75 = 75%, DI-50 = 50% and DI-25 = 25% Epan) approach to achieve economically sustainable crop production. As an alternative to full irrigation during the entire growing season, the irrigation at a rate of DI-75% Epan can be recommended as optimal level because it achieved irrigation water savings of 25%, an increase of 16% in forage yield irrigation water use efficiency, satisfactory crop morphological characters and an acceptable net income with a yield loss of only approximately 7% compared with full irrigation.
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    Publication
    Effect of rainfed and irrigated conditions on yield and quality traits of new-improved sunflower (Helianthus annuus) hybrids in a sub-humid climate
    (Indian Council of Agricultural Research, 2013-01-01) Öz, Mehmet; Karasu, Abdullah; Kuşcu, Hayrettin; Sincik, Mehmet; Turan, Z. Metin; Göksoy, A. Tanju; ÖZ, MEHMET; KARASU, ABDULLAH; KUŞÇU, HAYRETTİN; SİNCİK, MEHMET; TURAN, ZEKİ METİN; GÖKSOY, ABDURRAHİM TANJU; Mustafakemalpaşa Meslek Yüksekokulu; 0000-0001-9600-7685; 0000-0002-0012-4412; 0000-0002-1568-2564; AAH-1811-2021; AAG-9296-2021; AAH-4682-2021; AAH-1754-2021; GHD-7419-2022; S-5338-2018
    The study was carried out to compare the effects of a rainfed (non-irrigated) and irrigated conditions on yield, certain yield components and quality traits of new-improved sunflower (Helianthus annuus L.) hybrids in southern Marmara Region, Turkey having a sub-humid climate. Over two years (2006 and 2007), significant differences for all characters except plant height and crude oil per-cent were found between irrigation regimes (irrigated and non-irrigated conditions) while genotypes showed significant differences for all characters investigated. Also, genotype x irrigation regime interaction was highly significant for all traits except crude oil percent. In addition, year x irrigation regime, year x genotype and year x genotype x irrigation regime interactions were statistically significant for head diameter, 1 000 seed weight, seed yield and crude oil yield. The seed yield and crude oil yield increased highly with irrigations. The seed yield increases for irrigated treatment compared with non-irrigated treatment were 58.3 % in 2006 and 101.4 % in 2007. Compared with non-irrigated treatment, crude oil yield increases for irrigated treatments were 56.9 % in 2006 and 99.4 % in 2007. Differences between genotypes in seed yield and crude oil yield significantly varied according to irrigated and non-irrigated conditions. The control variety, Sanay and experimental hybrid, C 10 x R 10 produced more seed yield and crude oil yield than those of others in irrigated conditions, whereas highest seed yield and crude oil yield was obtained from the control variety, Muson in non-irrigated condition and differences among other hybrids were not statistically significant under rainfed condition.