00921nam a2200169   45000010003000000050017000030080041000200200015000610350003000760410007000790500021000861000020001072450086001272600064002133000011002775200463002888320230410143528.0060907n1979    dr                  spa    a0903031647    aEn14aS 616 S839s 1979  aStern, Peter H.1 aSmall scale irrigation :bA manual of low-cost water technology /cPeter H. Stern  aLondon :bIntermediate Technology Publications,c1979        a152 p.  aIntroduction : The irrigation scene, 13. -- The choice of technology, 19. -- Is it worthwhile irrigating?, 24. -- Moisture conservation techniques, 31. -- Surface irrigation, 38. -- Sub-soil irrigation, 53. -- Overhead irrigation, 55. -- Climatic factors, 64. -- Crops and water, 69. -- Physical and chemical characteristics of soil, 77. -- Soil and water, 83. -- Drainage, 91. -- Source development, 98. -- Channels and pipelines, 105. -- Water lifting, 115