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close this bookTraditional Field Crops (Peace Corps, 1981, 283 p.)
View the document(introduction...)
View the documentAbout this manual
View the documentAbout the author
View the documentAcknowledgments
close this folderIntroduction
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View the documentThe small-scale farmer and agricultural development
View the documentAssisting small farmers
View the documentThe ''Package'' approach to improving crop yields
View the documentThe role of the extension worker
close this folderThe agricultural environment
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View the documentThe natural environment
View the documentThe infrastructure
View the documentUnderstanding the individual farm unit
close this folderGuidelines for the orientation of the extension worker
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View the documentIntroductory orientation
View the documentOrientation to the farm unit
close this folderAn introduction to the reference crops
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View the documentCereal crops versus pulse crops
View the documentThe nutritional value of the reference crops
View the documentAn introduction to the individual crops
View the documentIncreasing reference crop production
View the documentReference crop improvement programs
View the documentCrop improvement programs for individual crops
close this folderPlanning and preparation
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View the documentCropping systems
View the documentLand preparation for cropping
View the documentSummary of land preparation recommendations for the reference crops
View the documentSeed selection
View the documentPlanting
close this folderSoil fertility and management
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View the documentDetermining fertilizer needs
View the documentFertilizer types and how to use them
View the documentChemical fertilizers
View the documentBasic guidelines for applving chemical fertilizers
View the documentDetermining how much fertilizer to use
View the documentRecommended fertilizer rates for the reference crops
View the documentFertilizer recommendations for specific crops
View the documentLiming
View the documentWater management
close this folderPest and disease control
View the documentWeed control
View the documentInsect control
View the documentMajor pests of the reference crops
View the documentMethods of insect control
View the documentSome important facts on insecticides
View the documentGuidelines for applying insecticides
View the documentDisease control
View the documentMajor diseases of the reference crops
View the documentChemical disease control recommendations
View the documentNematodes
View the documentBird and rodent control
close this folderHarvesting, drying, and storage
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View the documentFrom maturity to harvest
View the documentHarvesting and threshing
View the documentDrying and storage
View the documentLessons of the ''Green Revolution''
close this folderAppendices
View the documentAppendix A - Measurements and conversions
View the documentAppendix B - How to conduct a result test
View the documentAppendix C - How to conduct a result demonstration
View the documentAppendix D - How to conduct an elementary statistical analysis
View the documentAppendix E - How to convert small plot yields
View the documentAppendix F - How to take soil samples
close this folderAppendix G - Hunger signs in the reference crops
View the documentNitrogen
View the documentPhosphorus
View the documentPotassium
View the documentCalcium
View the documentMagnesium
View the documentSulfur
View the documentZinc
View the documentIron
View the documentManganese
View the documentBoron
close this folderAppendix H - Miscellaneous pulses
View the documentChickpeas
View the documentPigeonpeas
View the documentLima beans
View the documentMung beans
View the documentSoybeans
View the documentWinged beans
View the documentAppendix I - Troubleshooting common crop problems
View the documentAppendix J - Guidelines for using pesticides
close this folderAppendix K - Guidelines for applying herbicides with sprayers
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View the documentCalibration of backpack sprayers
View the documentCalibration of tractor sprayers
View the documentHow to clean sprayers
close this folderAppendix L - Important planting skill for extension workers
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View the documentCalculation of final stand
View the documentHow to determine amount of seed needed to plant a given field size
View the documentHow to determine a farmer's actual plant population
View the documentGIossary
View the documentBibliography
View the documentReferences


Zinc deficiencies occur where soil pH is above 6.8 and high rates of P are used, especially if placed in a band or hole near the seeds.


Maize shows the most clear-cut zinc hunger signs of all crops. If severe, symptoms appear within two weeks of emergence. A broad band of bleached tissue on each side of the midribs of the upper leaves, mainly on the lower part of the leaves, is typical. The mid-rib and leaf margin stay green, and the plants are stunted. Mild shortages may cause a striping between the veins similar to manganese or iron deficiency. However, in Fe and Mn shortages, this interveinal striping runs the full length of the leaf.


Similar to maize, but less interveinal striping, and the white band is more defined.


Interveinal yellowing of the upper leaves.