烤烟钾素库源关系生理调控措施研究

在大田生产条件下 ,采用单株挂牌设置处理的研究方法 ,研究涂抹生长素与其它不同生长调节剂和烟株顶端调控等措施对烤烟钾吸收及其在库源中再分配的影响。结果表明 ,现蕾后不打顶或打顶结合生长素处理茎断面均有利于不同部位叶片含钾量的提高 ,以打顶结合涂抹生长素效果更好 ;内源生长素和外源生长素都有利于烟株体内的钾素向叶片中分配 ,其中外源生长素的活性更强 ,能更有效地提高烟株叶片的含钾量 ,且涂抹 2次比涂抹 1次的效果好 ,但涂抹次数间差异不显著。

Effect of chlorine of ammonium chloride on restraining nitrification

A pot experiment conducted to investigate the nitrification of different nitrogen fertilizers in soil, the effect of chlorine of ammonium chloride on restraining nitrification under planting maize and without crop conditions and its influence on the nutrition and growth of maize. The results indicated that the order of nitrification for different nitrogen fertilizers was urea>ammonium sulfate>ammonium chloride. The nitrification was decreased when the urea or ammonium sulfate was combined with ammonium chloride. There was a marked negative correlation between the nitrification and the content of chlorine in soil. The chlorine of ammonium chloride could restrain the nitrification but its influence on restraining nitrification was related to the variety of nitrogenous fertilizers and the growth of crop. The effect of chlorine on restraining nitrification was stronger for urea than for ammonium sulfate, and as same as dicyandiamide. The nitrification of nitrogen in soil was promoted when the maize was planted, and the effect of chlorine on restraining nitrification decreased with maize growing and chlorine absorbed. The seedling of maize grew poorly when the nitrification was stronger or weaker. In this experiment, the suitable ratio of maize absorbed NH₄⁺-N and NO₃^--N was 1∶0 7～1 0, the ratio of NH₄⁺-N and NO₃^--N could be adjusted in soil and the biomass yield of maize increased when the ammonium chloride was applied rationally.