Cumulative Effects of Irrigation and Fertilizer on Soil Fertility1
- M. T. Vittum,
- D. J. Lathwell and
- G. H. Gibbs2
Irrigating Lima and Kendaia silt loam soils with an average of 10.7 cm of water each year for 13 years caused no change in soll pH, organic matter, or available P, Ca, and Mg. Irrigation significantly reduced available K from an average of 109 kg/ha in nonirrigated plots to an average of 97 kg/ha in irrigated plots.
Applying an extra 30 kg of P and 54 kg of K per hectare each year for 14 years significantly reduced soil pH, had no effect on organic matter, Ca, or Mg, and significantly increased available P and available K. At the end of the experiment, normal fertility level plots contained 25 and 96, and high fertility level plots contained 37 and 109 kg of available P and K per hectare, respectively.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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