Abstract
The effect of supplementary irrigation (SI) rate and planting date on water use efficiency of potato (Solanum tuberosum L.) was conducted during the 2017 and 2018 cropping seasons at the Research Farm of the National Root Crops Research Institute (NRCRI) Kuru, Jos in Plateau State, Nigeria. The treatments consisted of two planting dates (2nd week of April, 2nd week of May) and four levels of water application (W1 = Control, W2 = SI of 200 m3 W3= SI of 400 m3, W4 = SI of 600 m3). The factors were combined to give 8 treatment combinations that were laid out in a 2×4 split plot arrangement in a Randomized Complete Block Design (RCBD) and replicated three times. Water use efficiency of potato was computed using formulae. Crop and water use efficiency data collected were subjected to Analysis of Variance (ANOVA. Planting of potato in April uses water more efficiently and also gave higher potato yield. Interaction effect of planting in April x 400 m3 SI gave higher water use efficiency of potato. It is recommended that potatoes should be planted in the second week of April and rainfall augmented with 400 m3SI rates, especially at the period of dryspell.
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