Studies on variation regularity of cassava's starch and dry matter contents in Yunnan arid-hot valley.

In arid-hot valley of Jinsha river,25 cassava varieties(materials) introduced from Tropic Crops Genetic Resources Institute and other areas were planted experimentally,and each variety(material) was planted 0.1 hm2 in January 2007.The dry matter and starch contents of different tested varieties(materials) were determined in the main harvest periods of cassava as December 2007,January 2008 and February 2008,respectively,to study the variation regularity of dry matter and starch contents of different varieties(materials),and the best harvest period of different varieties(materials) was proposed to guide farmers and companies planting cassava with more benefit.