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Wilt of tomato and eggplant on Guam caused by Pseudomonas solanacearum.
1974
Zahner S.A. | Allen T.D.
Acao da oxitetraciclina sogre o calice gigante, molestia causada por micoplasmas.
1974
Ruegg E.F. | Cousin M.T.
[Evaluation of damage caused to tomato by the biotype A of the potato golden nematode [Heterodera rostochiensis]]
1974
Sosa Moss, C. | Gomez F, M.A.
Studies on the breeding of disease resistant tomato by interspecific hybridization, 3: On the breeding of a new tomato line resistant to bacterial canker caused by Corynebacterium michiganense
1974
Kuriyama, T. | Kuniyasu, K. (Vegetable and Ornamental Crops Research Station, Tsu, Mie (Japan))
On the occurence of tomato streak disease caused by multiple infection of tobacco mosaic virus and potato virus X in Ehime Prefecture [Japan]
1974
Shigematsu, Y. | Tachibana, Y. (Ehime-ken. Agricultural Experiment Station, Matsuyama (Japan))
The effect of successive croppings on soil organic phosphorus
1974
Appiah, M.R., Cocoa Research Institute, P. O. Box 8, Tafo, Ghana | Thomson, E.J., Department of Crop science, University of Ghana Legon
To investigate the effect of successive croppings on soil organic P, soil samples were cropped to maize, cowpea and tomato. Results showed a decrease in organic P during the first two cropping periods but a rapid build up in organic P during the third period. Uncropped soils showed minor change in organic P content over the three cropping periods. Phosphatase activity observed from the test plants indicated that the most likely cause of the decrease in organic P content seemed to be an increase in rate of mineralization of soil organic P associated with enhanced phosphatase activity in the soil around the roots. However, the inability of the extracts to mineralize soil organic P in the absence of plants suggests that the phosphatase activity becomes important after the initial breakdown of organic matter. The increase in organic P content of cropped soils during the third cropping period might have resulted from microbial immobilization of P as a result of increased microbial activity caused by plant secretions into the soil, by direct addition to the native organic P by plants and probably by re-wetting and airdrying of soils.
Mostrar más [+] Menos [-]Evaluacion da fungicides para el control de los tizones temprano y tardio del jitomate, causados por Alternaria solani (Ellis y Martin) Sor., Phytophthora infestans (Mont) DBy, en la zona de Atlatlahucan, Morelos.
1974
Cadena Hinojosa M.A. | Palacios Alvarez A.
