不同水分条件下旱稻磷效应及水分生产率

研究了4种灌溉水平的旱稻磷素效应和水分生产率,结果表明：水分胁迫并未降低旱稻根系含磷量,而且在严重水分胁迫下有所增加,但根系磷素累积量在营养生长阶段-30 kPa水分胁迫处理显著低于-10 kPa处理,中后期随水分胁迫程度加深而降低.在营养和生殖生长阶段旱稻茎含磷量和磷素累积量随水分胁迫程度加深而降低.分蘖期-10 kPa处理叶片含磷量最高,分蘖期、幼穗分化期和乳熟期-10 kPa处理叶片磷素累积量最大.穗含磷量以-10 kPa处理最高.与其他处理相比,-30 kPa处理产量虽然稍低,但可以提高水分生产率和磷素效率.

Phosphorus Efficiency and Water Productivity of Aerobic Rice under Different Water Regimes

The field experiment was carried out at Huibei irrigation experiment station, Henan province, from May to October, 2002. And the effect of four water regimes on phosphorus efficiency and water productivity of aerobic rice was studied. The results are as follows., water stress does not reduce phosphorus content of aerobic rice root, on the contrary, that of the severe water stress increased at vegetative stage and reproductive stage. However, as the water stress increases, the phosphorus accumulation of root decreases at vegetative stage and reproductive stage. As to stem-of aerobic rice, the phosphorus content and accumulation decrease as water stress becomes more serious, especially under W4. At vegetative stage, the effect of water stress on phosphorus content of green leaf is obvious, while the effect on phosphorus accumulation of it is at vegetative stage and panicle initiation stage. At maturing stage, phosphorus accumulation of green leaf and yellow leaf decreases as the water stress increases. The phosphorus content of panicle under Wl is the highest. Water stress may decrease the yield of aerobic rice, but promote water productivity and phosphorus efficiency. According to the experiment, W2 is the better irrigation regime for aerobic rice.