ABSTRACT

Fertilization management is a requested tool to limit the impact of salt stress on crops grown in saline conditions. The influence of saline irrigation water on the nutrient status of forage corn and fodder beet was studied in sandy soil. The experiments were conducted in containers during two seasons. Five water electrical conductivity levels were tested: 2, 4, 6, 8, and 10 ds.m⁻¹. The water of 0.7 ds.m⁻¹ was considered as a control. The tested salinity levels were obtained by adding sodium chloride (NaCl) to the control water. The results showed that the biomass of forage corn and fodder beet was significantly reduced by water salinity. The nutrient status of the tested crops showed a significant increase in phosphorus (P) contents with water conductivity. The increase in P content exceeded 13% and 11% for corn and fodder beet, respectively, at conductivity level over 4 ds.m⁻¹ compared to control. The plant potassium (K) content was significantly unaffected by saline water. The absorption of micronutrients (iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), and boron (B)) was not significantly depressed by salinity. A disturbance in magnesium (Mg) and calcium (Ca) absorption was noticed on both studied crops. The results reveal that fertilization management can be improved by considering the nutrient status shifting established at the saline conditions.

摘要

施肥管理是限制盐胁迫对在盐碱条件下生长的作物的影响的必需工具。在沙质土壤中研究了咸水灌溉水对饲用玉米和饲料甜菜营养状况的影响。实验在两个季节在容器中进行。测试了五个水电导率水平：2、4、6、8 和 10 ds.m ^-1。0.7 ds.m ^-1的水被认为是一个对照。通过向对照水中添加氯化钠 (NaCl) 获得测试的盐度水平。结果表明，水盐度显着降低了饲用玉米和饲料甜菜的生物量。受试作物的营养状况显示磷（P）含量随水电导率显着增加。^{在电导率水平超过 4 ds.m -1}时，玉米和饲料甜菜的 P 含量增加分别超过 13% 和 11%与对照相比。植物钾（K）含量明显不受盐水影响。微量营养素（铁（Fe）、锰（Mn）、锌（Zn）、铜（Cu）和硼（B））的吸收并没有被盐度显着抑制。两种研究作物都发现镁 (Mg) 和钙 (Ca) 吸收受到干扰。结果表明，可以通过考虑在盐碱条件下建立的营养状况转变来改善施肥管理。