Author : Yahya Fakuara Tasimin

Summary : Seedlings of P. kesiya were grown under nursery condition for of six months. The effects of nitrogen and phosphorus on mycorrhizal formation and growth were studied. The nitrogen sources (NaNO (subscropt 3), NH (subscript 4)NO (subscript 3), and urea) did not affect mycorrhizal formation as well as seedling growth. However, nitrogen levels (0, 50, 100, and 150 ppm) affected mycorrhizal formation, with 150 ppm NH (subscript 4)NO(subscript 3) producing the highest mycorrhizal formation. Inoculation treatment resulted in more superior mycorrhizal formation and seedling growth. On the contrary, inoculated seedlings were inferior to uninoculated seedlings in terms of number of roots and nitrogen content. Combination of 150 ppm NH (subscript 4) NO (subscript 3) with inoculation produced the highest mychorrhizal formation while combination of 50 ppm NH (subscript 4) NO (subscript 3) with inoculation produced the highest height and diameter increment. The phosphorus sources (rock phosphate and superphosphate) as well as phosphorus levels (0, 25, 50, and 75 ppm) did not affect mycorrhizal formation. However, phosphorus levels affected height and diameter increment with 75 ppm rock phosphate and 50 ppm superphosphate, producing the largest height and diameter increment. Inoculation treatment affected mycorrhizal formation and growth, with inoculated seedlings being superior to uninoculated seedlings. However, inoculated seedlings were inferior to uninoculated seedlings in terms of number of roots. Combination of phosphorus levels and inoculation affected mycorrhizal formation, with 25 ppm rock phosphate combined with inoculation producing the highest mycorrhizal formation.