Effect of light intensity and nitrogen-form on the growth, yield and translocation of assimilates in NFT [Nutrient Film Technique]-tomato [Lycopersicon esculentum] plants.
1992
Hohjo M. | Takizawa K. | Ito T.
1. Tomato plants, cultivar "Momotaro", were grown in Nutrient Film Technique with three levels of NH4-N concentrations, in connection with two light intensities (0% shading and 25% shading). 2. The worst plant growth was obtained at the highest NH4-N concentration under two light conditions. 3. The highest NH4-N concentration caused blossom end rot of tomato fruit, consequently resulted in the lowest yield under the 2 light conditions. Fruits from plants grown in the higher NH4-N concentration had higher sugar content. 4. The absorptions of calcium and magnesium by tomato plant were considerably restricted by the addition of NH4-N in the nutrient solution. 5. Nitrogen content in plant tissue increased with increasing NH4-N concentration in the nutrient solution. Whereas, Ca and Mg contents in the plant decreased with increasing NH4-N concentration. 6. Under the shade condition, keen competition for assimilates was observed between upper shoots and fruits in the first cluster during fruit development. 7. The addition of NH4-N to nutrient solution resulted in increasing plant growth and fruit quality. Further additional NH4-N, however, caused marked decreases in fruit yield.
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