Stevia rebaudiana B.'nin Verim ve Kalitesi Üzerine Bitki Sıklığı ve Biçim Zamanlarının Etkisi

Sentetik şekerin sağlığa zararlı etkilerinde kaçınmak, ayrıca doğal kaynaklardan şeker tedarik etmeye insanoğlunun ilgisi nedeniyle, şeker bitkilerine özellikle şeker otunun tarımına olan ilgi artmaktadır. Ekim sıklığı, biçim dönemi ve biçim sayısının şeker otu bitkisine etkisini incelemek amacıyla bir tarla denemesi yürütülmüştür. Akdeniz iklimine sahip olduğu bilinen Çukurova bölgesinde, Bölünmüş parseller deneme deseninde ekim sıklığı, 30 × 60, 45 × 60 ve 60 × 60 cm, ana parselleri ve değişik zamanlardaki biçimler alt parselleri oluşturmak üzere 3 tekrarlamalı bir deneme yürütülmüştür. Bir yetiştirme sezonunda 2 biçim olduğu için biçimler arası fark zamanda katılarak Bölünen bölünmüş deneme deseni kullanılarak istatistiksel olarak değerlendirilmiştir. Ekim sıklığı kuru yaprak verimine önemli etkide bulunmuş ve 30x60 cm mesafesindeki bitkilerden daha yüksek verim (110.9 kg da-1) elde edilmiştir. Çiçeklenme dönemi biçilen bitkiler yüksek kuru yaprak ağırlığı (20.55 g plant-1) ve kuru yaprak verimine (84.70 kg da-1) sahip olmuşlardır. Ayrıca birinci biçimden daha yüksek kuru yaprak ağırlığı ve verimi elde edilmiştir. Artan bitki sıklıklarından elde edilen yapraklar daha yüksek stevioside içeriğine sahip olmuştur. Çiçeklenme öncesi dönem stevioside üzerine önemli derecede olumlu etki yapmıştır.

The Effects Of Planting Density, Cutting Stage and Cutting Number On Yield and Quality Of Stevia rebaudiana B.

To avoid harmful health effects of synthetic sugar and also due to human attention to supply sugar from natural sources, the interests of the sugar plants cultivation, especially Stevia rebaudiana have been increased. A field experiment was conducted to study the effect of planting density, cutting stage and cutting number on Stevia. In Çukurova region, which is classified as Mediterranean climate. The experiment conducted in a split plot design consisted of three planting density, 30 × 60, 45 × 60 and 60 × 60 cm in themain plot and two cutting time in various growth stages in subplots with three replications. Since there were two cuttings in the season, the differences between cuttings, statistical analysis was valued by using split-split plot design in time. Planting density significantly affected the dry leaf yield and the higher yield (110.9 kg da1) was obtained from the plants, spaced 30 × 60 cm. Plants cutting at flowering stage had high dry leaf weight (20.55 g plant-1) and yield (84.70 kg da-1). Also, more dry leaf weight and yield were obtained from first cuttings. Leaves of closer plant densities produced high content of stevioside. Pre-flowering stage had significant effect on stevioside in the affirmative way.

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