Abstract:

Appropriate harvest time was studied to provide service to Pinellia ternata production in Karst warm climatic zero. Adopting small plot experiment in the field, taking fresh tuber yield, total alkaloids content and big, middle, small tuber as investigation basis, we studied effect of different harvesting time (time from August 1st to September 30th was divided into five harvest time) on yield and total alkaloids content. With the delay, fresh tuber yield of Pinellia ternata appeared an inverted-U parabola. Harvesting on September 1st, fresh tuber yield (1.51 kg/m2) was the tallest, total tuber number (1440.3 grain/0.5 m2) was the largest, proportion of middle tubers’ quantity to total grain quantity was 56.1%, total alkaloids content(0.0303%) was the tallest. So early and mid-September was the best harvest time of Pinellia ternata in Karst warm climatic zero.