红壤性水稻土早、晚稻吸锰规律的研究

Study on Rules of Mn Uptake by Early and Late Rice at Different Growth Stages in Paddy Soil Derived from Red Earth

以湖南农业大学1982年布置的长期定位实验为依托,研究了红壤性水稻土早、晚稻吸锰规律。结果表明,在水稻生育期间,早稻与晚稻的吸锰规律明显不同。早稻在分蘖期-孕穗期和齐穗期-成熟出现2个吸锰高峰,其吸锰量分别占其吸锰总量的30.9%和54.1%,而移栽前-分蘖和孕穗-齐穗2个时期的吸锰量很低,仅占吸锰总量的1.8%和13.2%。晚稻生育期间仅出现一个吸锰高峰,包括分蘖-孕穗和孕穗-齐穗2个生育期,其吸锰量占吸锰总量的71.0%,而移栽前-分蘖和齐穗-成熟2个时期的吸锰量仅分别占吸锰总量分别为6.4%和22.7%。不同地下水位、有机肥施用水平和稻作制对水稻的吸锰量影响不明显。

The rules of Mn uptake by early and late rices at different growth stages in the paddy soil derived from red earth were studied based on the long-term stationary experiment of Hunan Agriculture University. The main results are as follows：Mn uptakes by early and late rices were remarkably different during rice growth period. In early rice growth period, there were two peak stages for Mn uptake, i.e., tillering-panic formation and full headingmature stages, the relative proportion of total Mn uptake in the two stages amounted to 30.9% and 54.1%, respectively. Mn uptake by early rice plant were much less in transplanting - tillering and panic formation - full heading stages, their relative proportions of total Mn uptake in the two stages only accounted for 1.8 % and 13.2 %. While in late rice growth period, there was only one peak for Mn uptake, i.e., panic formation - full heading, the relative proportion of total Mn uptake in this stage reached 71.0%, the relative proportions of total Mn uptake in the other two periods, i.e., transplanting - tillering and full heading - mature stages, only accounted to 6.4% and 22.7%. The factors of various rice-based cropping systems, application rates of organic manure and groundwater levels on Mn uptake by rice had little influences.