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虽然不同种类蔬菜需肥量和吸肥速度各异,但与大田作物比较、蔬菜作物在矿质营养方面有其共同特点:一、蔬菜作物根系吸收能力强根部盐基代换量(阳离子代换量)是衡量根系活力的主要标志.阳离子代换量作为根带负电荷的强度,它的大小与地上部生长、营养元素的速度以及物质运输速度密切相关.阳离子代换量高的作物吸收两价离子——钙、镁量高,蔬菜作物阳离子代换量比禾本科作物的高出10—51.1毫克当量/100克干重(表1).
Although different types of vegetables and nutrient requirement fertilizer absorption rate varies, but compared to field crops, vegetable crops have common features in terms of mineral nutrition: a strong root absorption capacity of the roots of vegetable crops salt exchange capacity (CEC ) is the primary indicator to measure the root activity. cation exchange capacity as the root strength of the negatively charged, its size and the shoot growth, and is closely related to the speed of mass transport velocity nutrients high cation exchange capacity of the crops to absorb divalent The ion-calcium and magnesium contents are high, and the cation exchange capacity of vegetable crops is 10-51.1 milliequivalents / 100 g dry weight higher than that of grasses (Table 1).