The objective was to determine the physical and monetary productivity of irrigation water pumped in alfalfa forage produced on a commercial scale in La Laguna Region, Mexico between 1990 and 2009 compared whit the cultivation of irrigated pecan pump in Pequeña Propiedad sector. Identified six variables in the productivity of irrigation water, two physical productivity and four monetary productivity, from ratios, in which is divided, or the volume of water demanded per hectare of physical or monetary yield per hectare or the reverse. It was determined that the physical productivity of irrigation water pumping in alfalfa forage, is increasing in going from 0.267m3 / kg of alfalfa, to 0.219m3 / kg, which meant a decrease of 17.7% in watwer required per kg, in the base year there were 3.749 kilos of alfalfa per m3 used, while in the last three years were obtained using the same 4.557 kg m3 of water. On the other hand when compared with the pecan is noted that this showed a decreasing productivity because the base is 9.396 m3 of water required per kilo of physical product, while at the end of the period under review, a kilogram of nuts required to 9.756 m3 water to be produced also found that monetary productivity of irrigation water pumped in alfalfa grass is growing, from 0.776 m3 for every $ 1 of income generated for only 0.580 m3, in the base triennium obtained $ 1.29 of value / m3 was used, while in the last three years were obtained $ 1.73/m3, while the pecan crop was found decreasing productivity, since in 1990-1992, pecan pumping smallholdings producing cash income of $5.82 and as in 2007-2009 dropped to $3.60/m3. Comparing the two cultures was determined that the amount of physical output achieved in alfalfa per cubic meter of water is 35.229 times higher than that achieved by the pecan in the base year, but in 2007-2009, the indicator is equal to 44.461, said that alfalfa produced that year, 44.461 times per m3 physical product that pecan.
In terms of relative economic productivity, indicates that in 1990-1992, producing a cash income of $ 1, alfalfa, required to use 4.515 times more water than pecan, and by 2007-2009, to produce the same $ 1 of cash income sued 2.088 times more water than pecan, although it is a cash advance in productivity, since it fell 53.7% the relative amount of water, do not fail to note that the cultivation of alfalfa in relation to pecan is highly unproductive in terms of income in the account of water use. As the income generated by m3 of water used in pecan, showed, for the base period, a rate equal to 0.221, in percentage terms, a cubic meter of water used in alfalfa, generates only 22.1% of income be generated by cubic meter of water that was used in pecan for the base period rose to 47.9%, which, although a notable advance in the economic productivity of alfalfa, remains an index of monetary unproductive use irrigation water for alfalfa. The utility per m3 of used water in the irrigation water pumped was $0.883 in alfalfa and $2.232 in pecan during 2007-2009, the economic productivity of water grew in alfalfa and decreased in pecan since during the base period 1990-1992 both items generated $0.494 and $3.771, respectively. In relative terms, the gross utility per m3 of used water in the irrigation water pumped indicates that during the base period alfalfa only produced 13.1% of the profit generated by pecan while in the 2007-2009 period, this last produced 39.6%.