- Research in Agricultural Sciences
- Vol: 2 Issue: 4
- DEĞİŞİK SULAMA REJİMLERİNİN YONCALARIN KÖK AĞIRLIĞI, KÖKÜN KİMYASAL YAPI VE YEDEK BESİN MADDELERİNE ...
DEĞİŞİK SULAMA REJİMLERİNİN YONCALARIN KÖK AĞIRLIĞI, KÖKÜN KİMYASAL YAPI VE YEDEK BESİN MADDELERİNE KÜMÜLATİF ETKİSİ
Authors : Ibrahim Manga
Pages : 0-0
View : 11 | Download : 6
Publication Date : 2010-12-10
Article Type : Research
Abstract :ÖZET Değişik toprak derinliklerindeki faydalı rutubetin belirli oranlara düştüğünde yapılan sulamalar büzlerde yetiştirilen iki yıllık yoncaların 0-20 cm. derinlikteki kök ağırlıkları bu köklerin kimyasal " yapı ve yedek besin maddelerinin ağırlık ve oranları (ham protein oranı hariç) arasında %i ihtimal sınır/arı içerisinde çok önemli farklılıklar hasıl etmiştir. Kök ağırlığına bağlı olarak topraktaki faydalı rutubet oranı % O' dan % 50 seviyesine arttıkça yapılan sulamalarda köklerin kimyasal yapı ve yedek besin maddeleri miktarı da artmış, /~ 75 seviyesinde tekrar azalmıştır. Ancak oran olarak kimyasal yapı ve yedek besin maddeleri oldukça değişik bir trend arzetmıştir. Sulanan toprak derinliği de kök ağırlığı ve kökün kimyasal yapı ve yed~k besin maddelerine etkili olmuş, sulanan toprak derinliği yüzeyden itibaren aşağılara inildikçe bu maddelerin miktarları azalmıştır. Kuru madde, ham protein, ham seıüıoz, ham kül, ether ekstrakt ııe elverişli karbonhidrat oranlarında ise sulama derinliğinin etkisi değişik olmuştur. SUMMARY The Cumulative Effects of Frequency and Rale of Irrigation on Amounts, and the Chemica! Constituents and Food Reserves of Roots. This research was conducted to investigate the exfects of frequency and rate of irrigation on amount, and the chemical composition, and food reserves in the alfalfa roots which were grown in water-proof cylindrical concrete pots protected from rain. Those pots which were 30 cm. in diameter and 100 cm deep were embeded in soiI with a randomized block design, replicated four times. Differences in frequency of irrigation were determined 0-20 cm., and 50-80 cm. soiI levels. Differences in rate of irrigation were obtained by varying percentage of soil moisture (O %, 25 %, 50 %, and 75 %) at each soil level. There were, therefore, 12 combinations of treatments plus a control receiving only incident ra,in fall. All treatments cut at the end of bud stage. Two cuttings were made in 1966 and four in 1967. At the end of the experiment the roots in the pots were divided into 0-20 cm., 20-50 cm, and 50-80 cm. by cutting. Each part of roots which obtained at the different depth of pots were washed, dried at 78°e and put in the aluıniniumcups for analyzing of dry matter, crude protein, cellul03e, ash and etber extract and total available carbohydrates. The following results were obtained from this experiment: ı. The effect ofthe different frequency and rate of water supply on the amounts and the ehemical constituents, and food reserves at the 0-20 cm. depth of alfalfa roots was significanL 2. The amounts, and chemieal eonstituents, and food reserves of alfalfa roots were increased in weight in the decreased depth of irrigated soil by inereasing avaible moisture from O% to 50 %' 3. The irrigation regimes effeeted the rate of ehemieal eonstituents and food reserves differently. The rate of ether extract, and total avaibIe earbolıydrates increased in general, but dry matter -decreased and there were no effect on crude protein, cellulose and ash in the roots by inereasing avaible water -from 0% to 50 %' The rate of dry matter and crude aslı decreased,but crude cellulose inereased and crude proteiıı and total avaibIe earbohydrates were not ehanged witlı deeper irrigation. 4. In order to maintain a good stand at the limited root growth condüions, it may be reeomended to irrigate when the 50 % of avaible water is present in the 0-50 cm. depth of soiI.Keywords :