Nitrogen, phosphorus, and potash fertilizers in eight treatment combinations. inchdine. an unfertilized control treatment were given to Cassia siamea seedlings under nursery conditions. This study was carried out to identify the physiological basis of varying growth response due to fertilization. Nitrogenous fertilizer application increased seedling growth, whereas application of phosphorus or potash fertilizers, either separately or in conjunction, did not improve seedling growth. Starch level had increased considerably whenever there was decline in the leaf nitrogen status, even though the photosynthetic rate was reduced drastically. Starch concentration remained significantly higher in leaves of seedlings which

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