无土栽培番茄果实N养分变化动态

为了选择适合无土栽培番茄生长的基质配方，运用荷兰进口设备进行番茄无土栽培试验，以草炭、蛭石、珍珠岩和砂子为基质，采用不同的混配比例，比较了不同基质对番茄N养分变化的影响。结果表明：在不同的配方基质处理下，番茄植株从基质中吸收的N元素含量各不相同。从总体水平上看，草炭:蛭石:珍珠岩=1:1:1的基质配方要优于其它基质配方,有利于番茄对N的吸收；而且番茄体内的N含量有随生育期的延长而降低的趋势。

The Dynamics of N Nutrient of Tomato Fruit in Soilless Cultivation

In order to select the substrate treatment which adapt to tomato growth in soilless cultivation,the experiment was studied the changes of N nutrient in tomato that was planted in substrates mixed by different ratio,including grass peat,vermiculite,perlite and sand. The results showed that the N contents of tomato absorbed from the different treatments were obviously discrepancy. From the overall level,the mixed substrates of grass peat：vermiculite：perlite = 1：1：1 was conducive to the N absorption of tomato,and it was superior to other treatments. Besides,the N content of tomato was decreasing with prolonging growth period.