Download A Technical Manual for Parasitic Weed Research and Extension by J. Kroschel (auth.), Jürgen Kroschel (eds.) PDF

By J. Kroschel (auth.), Jürgen Kroschel (eds.)

Parasitic weeds of the households Cuscutaceae, Orobanchaceae and Scrophulariaceae are thought of to be one of the significant difficulties dealing with agriculture within the Tropics and Subtropics. within the final many years, huge, immense efforts were made and luck completed through scientists worldwide in gaining a greater figuring out in their biology and ecology in addition to of keep watch over equipment. besides the fact that, no large relief of infestation has been completed some time past and keep watch over options particular to the several parasites, plants and farming platforms needs to be additional constructed or tailored and realised between a much broader farming inhabitants with compatible extension equipment. This `Technical handbook' offers up to date methodologies for numerous elements of analysis and extension concerning parasitic weed species of the genera Striga, Alectra, Orobanche and Cuscuta. It has the purpose to help scientists and extension employees of foreign and nationwide learn and extension institutes and universities, who're both new to the topic or plan to use additional strategies they don't seem to be but favourite with.

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Ulmer Verlag Stuttgart, Germany. Kroschel J 1998. Striga - How will it affect African agriculture in the future? - An ecological perspective. ), Agroecology, Plant Protection and the Human Environment: Views and Concepts. PUTS 16(2): 137-158. Ptilschen L 1990. Natural site factors and agronomic aspects in the grain-plough complex of the Shewa Province, Ethiopia. PUTS 8(3), 84 pp. Schlichting E & H-P Blume 1966. Bodenkundliches Praktikum. Parey Verlag, Berlin, Hamburg, Germany, 205 pp. USDA 1967.

Data from the root system can be related to data from the plant parts above ground. * Linear regression equations with the parasite dry weightfm2 as the independent variable and the host dry weight/m2 as the dependent variable can be used to estimate the effect of the parasite on the host; correlation coefficients for these two variables will provide further information. * With regard to photosynthesis, sev- eral measurements at several times (five or more) during the day are required to obtain a complete set of data.

7. 05level) (Geipert et al. , of maize or sorghum). Since these yield calculations reflect more or less the realistic cropping conditions, they include losses due to pests, diseases, and weeds including parasitic weeds. , for each district of the surveyed area) dividing the actual yield by 100-x/100 with x being the relative yield loss caused by parasitic weeds (per district). COMMENTS • Yield loss assessments are very time consuming and costly and help in problem identification only. e. investigations have to be reduced to a statistically tolerable minimum of field inspections.

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