薏苡生物学特性和养分吸收特征研究

为明确不同薏苡在不同时期的生长特征及养分吸收特性，进行盆栽试验。结果表明：‘黔薏苡1号’与‘黔薏苡2号’在品种形态以及各时期生长形态具有显著性差异。在播种后60天，2种品种茎叶氮含量随着时间增加而逐渐降低。而根的含氮量均在孕穗期达到最大值，分别为2.85%和2.45%，成熟期时维持在1.76%和1.96%。2种品种茎叶钾含量自播种后60天达到最大值，最终两品种茎叶钾含量停留在1.84%和2.16%。然而，根的钾含量变化不大，播种后30天与成熟期的钾含量基本一致。相关性分析表明，茎叶氮、钾含量与干物质量、实粒数、结实率、千粒重、产量等5个产量性状均没有显著的相关关系，茎叶的氮含量与茎叶的钾含量对干物质量可产生直接作用。

Biological property and nutrient absorption characteristics of Coix lacryma-jobi L.

In order to confine the growth traits and nutrient absorption characteristics in different period between various cultivars of Coix lacryma-jobi .L, pot test was carried through. The Results showed that Qian No.1 Job's-tears (Coixlacryma-jobi .L) and Qian No.2 Job's-tears have significant differences between strain morphology and growth patterns. In 60 days after sowing, the two strains nitrogen content of straw gradually decreased with the increasing time. The nitrogen content of root all reached maximum at the booting stage, they were 2.85% and 2.45%.At the mature stage, they maintained 1.76% and 1.96% .In 60 days after sowing, the K content of straw achieved the maximum, finally, two strains of K content were 1.84% and2.16%. However, the K content of root changed little. The 30 days after sowing and maturity stage of the K content were basically identical. The correlation analysis showed that between the N,K content of straw and dry matter, grain number, seed setting rate, 1000-grain weight, production of five yield traits have no significant correlation, the N and K content of straw have a direct effect on the dry matter weight.