Empirical Analysis of Weighted Grey Situation Theory for the Planting Altitude Standard in Lijiang Maca

It is the scholars unilateral conclusion that maca(Lepidium meyenii Walp.) is suitable for planting in the area more than 3 000 meters. In this study, we introduced the weighted grey situation decision theory to overcome the deficiency of the probability theory analysis method, the measure value on comprehensive effects was more complete and reasonable. The measure value of comprehensive effects results showed that, the comprehensive evaluation value of maca grown in more than 3 000 meters was higher than 0.600 0, on the contrary, the comprehensive measure was less than 0.600 0. The calculated data showed good agreement with the years experience. The method is successfully used in maca selection, fill in the past only from the production practice judgment maca is suitable for growing in the altitude of the vacancy.