國家重點研發計劃項目（2017YFC1700704）; 湖北省重大科技項目（2017ACA175）; 湖北省農業科技創新行動計劃
為探究間作玉米對半夏生長及藥材質量的影響，在固定半夏播種密度條件下，設置玉米寬窄行和等行2種間作方式并分別設置35、50和65 cm 3種株距，分析間作玉米條件下半夏生長環境的改變、半夏生長狀況、間作〖JP2〗系統的土地當量比和種間競爭力以及半夏產量和藥材質量的變化。結果表明：隨著玉米種植密度的增加，半夏冠層光照強度降低，半夏葉面溫度降低，土壤溫度降低；間作玉米顯著增加了半夏主葉葉面積、半夏出土部分葉柄長及半夏葉片SPAD值；間作系統中土地當量比增加，玉米競爭力強于半夏；〖JP2〗間作玉米顯著提高了半夏產量以及千粒重，其中以玉米35 cm株距等行間作下半夏產量最高，較半夏單作增產44%；間作玉米下的半夏藥材質量和對照無顯著性差異，均符合藥典要求。間作玉米可為半夏提供更好的生長環境，增強半夏生長勢，提高半夏產量。
Under normal Pinellia sowing density,two intercropping methods including corn wide-narrow rows and equal rows and three corn planting distances including 35,50,and 65 cm were conducted to study the changes of Pinellia ternata growing environment,growth,yield and quality of P. ternate. The land equivalent ratio and interspecies competitiveness under the intercropping system were analyzed. The results showed that the leaf surface temperature,the soil temperature and the canopy light intensity of P. ternata were decreased with the increase of corn planting density in P. ternate/Corn intercropping system. Compared with the control,the leaf surface temperature of P. ternata decreased by 6.8 ℃,and the soil temperature decreased by 4.3℃. whereas the main leaf area,petiole length and SPAD value of P. ternata were significantly (P＜0.05) increased in the intercropping system. The growth index of corn with a 35 cm equal rows plant spacing is the best compared with the control. The main leaf area,petiole length and the SPAD value increased by 4.85 cm2,2.25 cm and 8.5,respectively. The land equivalent ratio in the intercropping system increased. Corn was more competitive than P. ternate. Intercropping corn significantly increased yield and single tuber weight of P. ternata. Under the condition of corn with a 35 cm equal rows plant spacing,the yield of P. ternata was the highest,with an increase of 44% compared with P. ternata monoculture. There is no significant difference in the medicinal quality of P. ternata under the intercropping corn,which meets the requirements of Chinese Pharmacopoeia.