This manual is designed to give detailed, practical advice on the various methodologies of organic recycling. Blue-green algae form a self-sufficient system which is capable of fixing atmospheric nitrogen in organic forms and which grows upon a free water surface. It is thus ideally suited for propagation in rice fields. The development and use of blue-green algae require special techniques. The manual summarizes the present status of algal biofertilizer technology for rice with practical information for its adoption by agricultural extension personnel and subject matter specialists.

Households' Livestock Management in Relation to Population Movements and Land Use Practices among the Rendile

Revisa la magnitud de la deforestación, delineando las características principales de los ecosistemas de la Región Amazónica, en especial la brasilera, para examinar el impacto ambiental del uso de la tierra. Analiza principalmente los factores que afectan la estabilidad agrícola.

Data are given of area planted to beans, production, and yields in the Andean countries during 1964-66, 1974-76, and 1978; production, trade, and consumption during 1963-65 and 1973-75; and production, area, and yield growth rates during 1966-76. Constraints for bean productivity, cropping systems, and the main bean types consumed in the Andean countries are indicated. Finally, the potential of this crop is analyzed and data of land use and population patterns in the Andean countries are included. (CIAT)

Drought stress was imposed on 2 cassava cv. (M Col 22 and M Mex 59) at Santander de Quilichao (Colombia), by withholding rainfall from field plots (plastic covers were placed over the soil surface) for 10 wk, commencing when crops were 12 wk old. The plants were then allowed to recuperate until the expt was terminated at 10 mo. Harvests were taken at intervals through the growth cycle and were supplemented with measurements of fine root distribution, leaf production and senescence, soil and plant water status, and stomatal response. As a result of the stress, the late-developing cv.