Phosphorus Accumulation by Sesame Seedlings as Influenced by Burned Rice Husk, Aluminum and Phosphorus

Abstract

The influence of burned rice husk, aluminum, and phosphorus on growth and P content of 30 – d – old sesame (Sesamum indicum L., cv. Roi Et 1) grown in Yasothon sandy loam (Oxic Paleustult) soil was stu in a greenhouse experiment. Treatments, replicated three times, were 0, 1.25%, and 2.5% burned rice husk, 0, 25, 50 and 100 mg kg^-1 Al as AlCl₃, and 0, 6, and 18 ppm P as Ca (H₂PO₄)₂ . H₂O in a randomized block with a factorial arrangement of treatments. The results indicated that increasing the P and burned rice husk supply significantly increased yield of both shoots and roots but increasing the Al supply depressed plant growth. Higher rates of phosphorus and burned rice husk applications were needed to obtain good yield as the Al levels were increased. Total P accumulation in the shoots dropped markedly as the Al treatments were increased from 0 to 100 mg kg^-1 Al. However, total P content and P concentration were increased by raising the burned rice husk supply from 0 to 2.5%. There was also a marked effect of increased burned rice husk supply on increasing soil pH and Bray II extractable soil P.