Pengaruh Intensitas dan Saat Pemberian Naungan terhadap Hasil Ubi Jalar (Ipomoea batatas (L.) Lam.)

Abstract

This experiment was carried out at Dannaga Experimental Station IPB, Bogor from October 1983 to March ~984. Factorial with randomized block design in three replicates was used on sweet potato of Daya variety. Shading intensity of 0, 25 and 50 percent were given at 7, 11, 15 weeks after planting. Shading intensity of 25 percent decreased marketable tuber yield 42 percent, and total tuber yield 24 percent while. Shading intensity of 50 percent decreased marketable tuber yield 63 percent and total tuber yield 50 percent. Time of shading indicated the trend that the earlier the crop was shaded and the higher the shading intensity, the lOwer the tuber yield.