Response of barley and wheat to phosphorus in the presence of chloride and sulphate salinity
Response of barley and wheat to phosphorus in the presence of chloride and sulphate salinity
复制标题
大麦和小麦在氯化物和硫酸盐盐度存在下对磷的响应
作者：
H. Manchanda;S. Sharma;D. K. Bhandari
本研究在温室和田间条件下进行。在温室中，大麦在桑迪土壤上的盆中生长至成熟，所述沙质土壤在其饱和提取物中含有80和120 meq/l的氯化物和硫酸盐主导盐，向所述饱和提取物中添加0、10、25和50 ppm P。在田间研究中，小麦种植在磷添加水平为0、25、50和75 kg/ha的壤土沙土上，并用Cl-或SO 4-为主的盐水沃茨（EC=15−19 mmhos/cm）。温室研究结果表明，在成熟期大麦秸秆和籽粒产量显着增加50 ppm的添加磷的非盐对照和Cl-处理。SO_4 ~-处理以25 ppm磷为最佳。随着土壤磷含量的增加，植株体内氯含量显著降低，硫含量显著增加。大麦地上部硫、磷含量之间存在协同关系。在田间研究中，小麦籽粒产量对Cl-位点上50 kg/ha水平的磷肥施用量有显著的响应，而对SO 4-位点上的磷肥施用量没有响应，尽管前者比后者含有更多的Olsen P。结果表明，小麦和大麦对Cl-的磷需求大于SO 4-。
SummaryThe study was conducted in a greenhouse and under field conditions. In the greenoouse, barley was grown to maturity in pots on a sandy soil which contained 80 and 120 meq/l of chloride and sulphate dominant salts in its saturation extract, to which 0, 10, 25 and 50 ppm P were added. In the field study, wheat was grown on loamy sand soils having 0, 25, 50 and 75 kg/ha added P levels and irrigated with either Cl- or SO4-dominant saline waters (EC=15−19 mmhos/cm). The results of the greenhouse study indicated that at maturity barley straw and grain yield was significantly increased by 50 ppm of added P both on the non-saline control and the Cl-treatments. However, 25 ppm P was optimal on the SO4-treatments. The Cl content of plants was significantly decreased and S was increased with the increase in the P content of soil. A synergistic relation between the S and P content of barley shoots was observed. In the field study wheat grain yield responded significantly to P applications upto 50 kg/ha level on the Cl-site and there was no response to applied P on the SO4-site, although the former contained more Olsen's P than the latter. The results suggested that P requirement of wheat and barley was greater on Cl- than on SO4-salinity.