Dominant Mer'a Bitkilerinin Biomas ve Kimyasal Kompozisyonlarının Büyüme Dönemindeki Değişimi II. Kimyasal Kompozisyondaki Değişimler

Bu çalışma 1994 yılında Atatürk Üniversitesi Kampüsünde otlatmaya kapalı alandan seçilen otlak ayrığı, havlı brom, koyun yumağı, adi parlakot, adi sorguçotu, melez yonca ve top kekiği üzerinde yürütülmüştür. Araştırmada bitkilerde ham protein oranı (HPO), ham selüloz oranı (HSO), P, K, Ca, Mg muhtevası ve K/(Mg+Ca) oranı incelenmiştir. HPO tüm bitkilerde olgunlaşmayla birlikte azalmış, HSO ise artmıştır. Fosfor, Potasyum ve Magnezyum kapsamları olgunlaşmanın ilerlemesiyle azalmış, Kalsiyum ise çiçeklenme başlangıcına kadar artmıştır. Yapraklar her dönemde saplardan daha fazla besin elementi ihtiva etmiştir. Özellikle buğdaygillerde başlangıçta yüksek olan K/(Ca+Mg) oranı bitkilerin sapa kalkmalarından sonra hızla azalmıştır.

Variation in Biomass and Chemical Composition of Dominant Rangeland Plants During the Growing Season II. Changes in Chemical Composition

This study was conducted to determine the annual variations in crude protein, crude cellulose, P, K, Ca and Mg contents, and the ratio of K/(Ca+Mg) of crested wheatgrass, subalpine brome, sheep fescue, junegrass, needlegrass, hybrid alfalfa and cat thyme in Erzurum rangelands, during the 1994 growing season. Crude protein, P, Mg and K contents steadily decreased toward to end of the growth stage although cellulose content increased. Ca content increased until blooming stage in all plants. Plant leaves had richer nutrient contents than the stems in all growing periods. The K/(Ca+Mg) ratio was high at the beginning of the vegetative stage especially in grasses, but quickly decreased after stem elongation.

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