Soil Organic Matter Levels and Crop Yields in Puerto Rico
1954
Lugo-López, M. A. | Bonnet, J. A. | Hernández-Medina, E. | Landrau, P. | Samuels, G.
No increases in organic-matter content were observed in some latosols of Puerto Rico with an open porous structure and low fertility level when treated with different quantities of velvetbean green manure, sugarcane trash, and filter-press cake. Increased yields of corn were obtained only when the soil was treated with velvet bean green manure, probably because of increased nitrogen supply. Definite increases in organic-matter content were obtained with the above treatments in heavy-textured nonlateritic soils of moderate fertility, but unfavorable physical conditions. In this case, increased yields of sugarcane and pineapple were obtained probably due to the favorable effect of increased amounts of organic matter on the physical conditions of the soils. The seven field experiments reported here have been established for relative short periods only, not over 7 years, but some of them are scheduled for long-time duration.
显示更多 [+] 显示较少 [-]