科研之友
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摘要
A greenhouse experiment was carried out from January to June 2008 at FCAV/UNESP, Brazil, to study dry mass production, absorption rate and macronutrient accumulation in Merremia aegyptia, an important weed in annual and perennial crops in Brazil. The plants were grown in seven liter pots with sand substrate and irrigated with Hoagland and Arnon nutrient solution. The treatments corresponded to the evaluation times, at 14 day intervals, beginning at 21 days after emergence (DAE). Plants of four pots were analyzed for growth and mineral nutrition. M. aegyptia showed small dry mass and macronutrient accumulation at the beginning of the experimental stage, which was intensified after 49 DAE. The main structures accumulating dry mass in the first half-stage were the leaves, and in the second half-stage, the stems. N and K accumulated more in M. aegyptia plants. The maximum theoretical period of dry mass and macronutrients for M. aegyptia occurred between 146 and 160 DAE.
- 出版日期2010
