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Response of White Rose potato to different irrigation regimes



Response of White Rose potato to different irrigation regimes



Rev Invest Agropecuar Ser 2 Biol Prod Vegetal 3(6): 67-108



With the purpose for establishing the best irrigation regime for "White Rose" potato, field experiments were carried out during the growing seasons of years 1962-63 and 1963-64 (from middle of Nov. to April) in 2 different soils: sandy loam (Wfc=18.5%; Wwp=4.8%) and fine sandy loam (Wfc = 22.0%; Wwp = 7.7%). Irrigation treatments differed in the minimun levels of soil moisture at time of watering and were grouped in 2 series: (I) the first irrigation when the 80% of the plants emerged. (II) the first irrigation when the symptoms of drought were evident. It was found out that by postponing the first irrigation, no saving in the use of water was observed, neither was a better quality of the production obtained. It was also proved that low levels of available water could delay the beginning of the tuberization stage in 20 to 45 days. The percentage of available water appeared to be a better index than the matric potential for expressing correlations between minimal water level and yield comprehending different soils and/or irrigation regimes. Potato yield was proportional to total actual evapotranspiration (Ea). For the best treatment, total Ea ranged between 613 and 642 mm, incluing 235 and 116 mm of rainfall, respectively. Taking into account yield and quality, the most advisable irrigation regime seems to be the following: watering from emergence until the end of the growing period, whenever the water content failed to 40-45%. This regime meant one irrigation every 6 to 11 days free of rainfall. For this treatment, K values of 0.82 (1st year) and 0.92 (2nd year) from Blaney-Criddle formula were obtained. For the best treatment, the ratio between observed Ea and calculated Ea, after Grassi-Christiansen is formula, was the practical unit.

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