Effect of Naphthoquinone Derivative, 2-Benzimidoyl-3-Hydroxy-1, 4-Naphthoquinone on the Growth of Tomato
II. Effect of Partial and Whole Plant Spray
1980 Volume 48 Issue 4 Pages 459-467
Details
1980 Volume 48 Issue 4 Pages 459-467
1) Effects of the partial and the whole plant spray of naphthoquinone plant growth regulator, 2-benzimidoyl-3-hydroxy-1, 4-naphthoquinone (bendroquinone) to the tomato plant on the growth were investigated.
2) The total yield per plant (cv. Fukuju Ni-Go, in the plastic greenhouse) was higher when bendroquinone was sprayed on and around the clusters at the rates of 100, 200 and 300ppm as compared with the cluster spray of 4 CPA at 15ppm. Particularly, the yields of the second and the third clusters were increased markedly by bendroquinone. The phytotoxicity of bendroquinone scarcely arose at the rate of 100ppm. However, at the rates of 200 and 300ppm, the leaves partially shrank. Phytotoxicity arose sharply from 4 CPA spray.
3) When bendroquinone was sprayed on the whole plant every week, every other week or 10 days before planting and at the flowering time of each cluster (cv. Beiju, in the plastic greenhouse), the yield of the first cluster was low but the total yield per plant was nearly equal to that by the cluster spray of HCPA or 4 CPA.
4) After 200ppm HCPA or 30ppm 4 CPA was sprayed on the first cluster at the flowering time, 50 or 100ppm bendroquinone was sprayed on the whole plant at the flowering time of the second and third clusters (cv. Beiju). The yield of the first cluster and the total yield per plant were higher than those by the cluster spray of HCPA or 4 CPA.
5) In the case of field grown tomatoes for commercial processing, the harvesting time of fruits was controlled by the whole plant sprays of 200 or 300ppm bendroquinone at the flowering time of the first and the second clusters of the first lateral shoots (cv. Wasedarum). 200 or 400ppm bendroquinone was sprayed on the whole plant at each developmental stage of the first, the second and the third lateral shoots (cv. Chico). The elongation of the lateral shoots was inhibited from 3 to 5 weeks after spraying and then promoted. The number of colored fruits and the yield per plant were increased by the spray at the developmental stage of the third lateral shoots.
