土壤酸碱度对种花有何影响?
土壤酸碱度即土壤的氢离予浓度指数,用pH值表示,其范围通常在1~14之间。pH值在6.5~7.5之间为中性土壤;大于7.5时为碱性土壤;小于6.5时为酸性土壤。用pH试纸可测定pH值。将试纸浸入用水稀释的土壤中,试纸变红色为酸性土,变蓝色者为碱性土,对照色谱可测知土壤的酸碱浓度。
土壤的酸碱度直接影响花卉的生长。大多数花卉在中性或偏酸性的土壤里生长良好,从土壤中吸取的营养成分都是可溶性状态。如果酸碱度对花卉不适宜,土壤中营养成分变成不可吸收状态,引起某些花卉发生营养缺乏症。
各种花卉对土壤的酸碱度有着不同的适应范围,一般可通过施入酸性或碱性的肥料来改变土壤的酸碱度。
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