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The Effects of Nitrogen and Phosphorus Sources on Mycorrhizal Formation and Growth of Pinus Kesiya Royle Ex. Gordon Seedling
Dissertation Abstract:
Seedlings of Pinus kesiya were grown under nursery conditions for six months. The effects of nitrogen and phosphorus on mycorrhizal formation and growth were studied.
The nitrogen sources (NaNO3, NH4NO3, and urea) did not affect mycorrhizal formation as well as seedling growth. However, nitrogen level (0, 50, 100, and 150 ppm) affected mycorrhizal formation, with 150 ppm NH4NO3 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 NH4NO3 with inoculation produced the highest mycorrhizal formation while combination of 50 ppm NH4NO3 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 diamter 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.
Based on the results of this study, the recommendations were: in terms of planting material production, it is advisable to apply either 150 ppm NH4NO3 or 25 ppm rock phosphate; and further study must be done on the effect of nitrogen of phosphate sources on mycorrhizal formation and growth under different soil pH and the effect of mycorrhizal formation on the chemical properties of grassland soil.