منحنى الحليب متعدد الأوجه لأبقار الهولشتاين فريزيان السعودية

Abstract

The demand of fresh vegetables, such as carrot have been increased in Saudi Arabia in recent years. Thus, field studies were undertaken to investigate the effect of planting dates, 14th October and 4th November on the growth and the objective component of two carrot cultivars (Chantenay and Nantes). The experiments were conducted during 1992/93 and 1994/95 seasons at Oeirab Agricultural and Research Experimental Station, near Riyadh. Treatments were replicated four times and arranged in split-plot design. In general, the results showed that planting dates did not affect the leaf number, shoot length, carotenoids, total sugar and non reducing sugar for both seasons. However, the later planting date (4th Nov.) significantly reduce the total yield. Shoot fresh weight was also affected by the difference in planting dates. Analysis of variance showed no significant difference on the growth and yield between the two cultivars tested. No significant interaction was observed between cultivars and planting dates on the carrot growth and objective component.