Factors influencing the productivity of irrigated crops in southern Peru, in relation to prediction by simulation models.

Versteeg, M. N.

doi:10.18174/njas.v33i1.16871

Cited by 3 publications

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“…The inclusion of the trait for earliness during the selection of drought-tolerant cultivars has been recommended for cereals (O'Mara 1987) and DTO33 was identified as drought tolerant in northern China, mainly because of its drought avoidance. Versteeg (1985), working with potatoes, also showed through calculations that, when irrigation supply is irregular, the planting of early-maturing clones is in general appropriate for achieving acceptable yield. Where data for calculation of a water balance were collected (Table 6), comparisons of WUE between treatments based on water use were possible.…”

Section: Water Stress and Season Effects On Water Use Efficiencymentioning

confidence: 99%

Effect of water stress on potato growth, yield and water use in a hot and a cool tropical climate

Trebejo

Midmore

1990

J. Agric. Sci.

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S U M M A R YIrrigation experiments are described in which three cultivars were subjected to varying degrees of drought in the cool and hot seasons in Lima, Peru. The most severely draughted plots received, on average, 20 % and 35 % less water than the well-watered control plots, resulting in 20 % and 52 % yield reduction in the cool and hot seasons, respectively. Average fresh tuber yields ranged, according to cultivar, from 1370 to 2450 g/m 2 in the summer and from 2800 to 4450 g/m 2 in the winter, with tuber dry-matter percentages of c. 17% and 20%, respectively. The production of total dry matter per unit intercepted solar radiation (the conversion coefficient, estimated from the slope of the regression, in g/MJ) was markedly less during the hot season but, regressed on a photo thermal quotient S ((MJ/m 2 )/(°C > 4-5°C)), a common relationship across seasons was achieved. The conversion coefficient was less in draughted than in well-watered plots, more so in the hot season.Crop transpirational and evapotranspirational water use efficiencies (WUE) were less in the hot season largely because of the greater saturation vapour-pressure deficit. However, because of greater harvest index (HI) and more-efficient interception of solar radiation per unit of applied water by draughted than by well-watered plots in the summer, and despite a lower conversion coefficient, draughted plots showed greater WUE. Based on total water applied and final fresh tuber yields, WUE was, on average, 3-9 and 12-4 kg/m 3 in the hot and cool seasons, respectively, values close to the extremes of the range of published values. Low HI in the summer was, to some extent, responsible for this seasonal difference. These data illustrate the range of values of WUE for t h e p o t a t Q j n c o o , c l i m a t e s b u t t h d r v a i u e i nThe potato crop is generally recognized as shallow-interpreting the climatic influence on WUE is limited rooted and sensitive even to mild water stress (van since they are confounded by varietal responses to Loon 1981). With the introduction of potatoes to hot applied water. To interpret the influence of cultivars tropical areas, particularly during the 'cooler' dry and climate on water use efficiency, detailed studies winter season when lower night temperatures do not involving both factors and permitting quantification inhibit tuberization (Midmore & Rhoades 1987), high of crop growth, canopy development and light evaporative demand will increase the crap water interception and their relationships to soil water requirement and may compound the sensitivity to balance are necessary. Water stress is known to water stress, resulting in greater yield decline than reduce expansion of leaves, interception of solar that from similar water stress under cooler conditions, energy and efficiency of conversion of intercepted In a summary of data published on the optimum radiation to dry matter (van Loon 1981), and it was water requirements for potato in cool climates, our intention to quantify these effects on potato Doore...

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Section: Water Stress and Season Effects On Water Use Efficiencymentioning

confidence: 99%