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为了研究盐分胁迫对菠菜生长和吸氮量的交互影响,在光培养室内开展了土柱栽培试验。试验设置3个灌溉水含盐量水平:0.87dSm-(1淡水,S0)、2.0dSm-(1盐分胁迫,S1)和5.0dSm-(1盐分胁迫,S2),2个氮肥水平:100kg Nhm-2(N1)和300kgNhm-(2N2)。本试验条件下,菠菜生育期为54天。在前44天,随着盐分胁迫程度增加,菠菜相对生长速率(relative growth rate,RGR)降低,其中在33~44天时,N1水平下,S0处理的RGR最大,为1.30×10-1gg-1day-1;在生育期的后10天,随着盐分胁迫增加,RGR升高。盐分胁迫导致菠菜吸氮量和干物质重下降。盐分胁迫和氮肥的交互影响使菠菜吸氮量降低47.02mgpot-1。菠菜吸氮量是其生长时间的二次函数。该研究表明,S2水平下,菠菜生育前期施肥量高,抑制作物生长。
In order to study the interactive effect of salt stress on the growth and N uptake of spinach, a soil column cultivation experiment was carried out in a light culture room. Three salt water levels (0.87 dSm- (1 fresh water, S0), 2.0 dSm- (1 salt stress), and 5.0 dSm- (salt stress, S2) -2 (N1) and 300 kgNhm- (2N2). Under the experimental conditions, the growth period of spinach is 54 days. In the first 44 days, the relative growth rate (RGR) of spinach decreased with the increase of salt stress, and the maximum RGR of S0 was 1.30 × 10-1gg-1day -1; RGR increased with salt stress increasing ten days later. Salt stress led to spinach nitrogen uptake and dry weight decreased. The interaction between salt stress and nitrogen fertilizer decreased spinach nitrogen absorption by 47.02mgpot-1. Spinach nitrogen uptake is a quadratic function of its growth time. The study shows that, S2 level, spinach early fertilization high growth rate, inhibition of crop growth.