Growth pattern of fifteen upland rice varieties in shading stress

Abstract

Shading stress will affecton varieties growth of upland rice especially in the vegetative phase. The objective of this research to study the growth pattern of fifteen upland rice varieties in shading stress treatment. The research was carried out in Cengkeh turi Binjai started from May to August 2018. The research used a split plot design with two factors. The first factor was the shading stress, consist of; control, 25%, 50% and 75%. The second factor was15 upland rice varieties, consist of: Inpago 5, Lipigo 4, Inpago 8, Inpago 10, Towuti, Kalimutu, Limboto, Black rice, Red rice, IPB 8G, IPB 9G, Lipigo 1, Lipigo 2, Situ patenggang, and Situ bagendit. Decreased of light intensity caused of increase plant length on shading stress treatment 25% were 4.24%. Shading stress treatment in 25%, 50% and 75% will decreasing the number of tillers. Similarly, the parameter of dry weight was decreased in accordance with the increasing in the shading stress treatment that given. Chlorophyll a content was higher than chlorophyll b at all shading stress and varieties. Different from black and red rice which have higher chlorophyll b content at 50% and 75% and Lipigo 1 at 75% shading stress treatment.