摘要
为探明不同水、氮供应条件下水稻锰素营养状况，观察了不同地下水埋深模拟水分胁迫、铵态氮和硝态氮施用比例对水稻锰素养分吸收的影响，并分析比较了8个水稻品种在水、旱作条件下分蘖期和成熟期植株样品的锰含量。结果表明，在10～50cm范围内，随着地下水埋深增加剖面各层土壤中有效性锰含量显著下降，平均从3．96mg·kg“降到1．52mg·kg，造成水稻作物体内锰素含量下降50％以上。非充分灌溉条件下，仅施硝态氮肥能明显抑制水稻对锰的吸收，这可能造成碱性、石灰性土壤上旱作水稻锰营养不良，但在酸性和中性土壤上则可减轻锰素毒害。与充分灌溉处理相比，非充分灌溉条件下除了武育粳3号水稻在分蘖期锰吸收量仍达到水作处理的59．4％，其他品种均在25％以下。供试8个品种水稻成熟期体内锰含量仅相当于相应对照（水作）处理的3．5％～10．8％。
Although available manganese is usually abundant for the growth of rice cultivated in waterlogged condition, the rice crop may suffer from manganese deficiency when in aerobic soil which properties are totally different from those in waterlogged condition. Solubility of manganese is very low in soils with high Eh and/or high pH. A field experiment with five different depths （10, 20, 30, 40 and 50 cm） of groundwater, and a pot-experiment with five ammonium-nitrate ratios （ 100/0, 75/25, 50/50, 25/75 and 0/100） were conducted to study the characteristics of manganese nutrition of rice in nonflooded condition. Moreover, the contents of manganese extracted by 1 mol·L^-1 HCl from rice plant samples of eight cultivars with both aerobic and waterlogged cultivations were analyzed to study the effect of irrigation regimes on manganese content of rice plants. The average content of available Mn （3.96 mg·kg^-1） of the soil treated with 10-cm depth of groundwater was significantly higher than that （ 1.52 mg·kg^-1 ） with 50-cm depth of groundwater, and the manganese concentrations of rice plant of the former was much higher than that of the latter. Manganese deficiency of rice was resulted from the utilization of nitrate instead of ammonium in nitrogen fertilizer applied at different intervals in aerobic cultivation. The manganese concentrations of rice plants in all cultivars cultivated in aerobic condition were lower than 25 % as compared with those in waterlogged condition at tillering stage except for Wuyujing 3 （59.4%）. And even much significant difference existed in the manganese concentrations of different cultivars between aerobic and waterlogged cultivation conditions at maturity, and the former was only about 3.5 %-10.8% of the latter.
出处
《作物学报》
CAS
CSCD
北大核心
2006年第11期1689-1694,共6页
Acta Agronomica Sinica
基金
国家自然科学基金资助项目(30370816)
江苏省自然学基金资助项目(BK2002049)
关键词
水分胁迫
氮素形态
水稻
锰素营养
Water stress
Nitrogen form
Rice
Manganese nutrition
