论文部分内容阅读
引言 白浆土是我国东北三江平原地区主要耕地土壤,其面积近一千万亩,占当前耕地面积的60％左右。这个土壤是发育在第四纪河湖粘土沉积物上,耕层(黑土层)内养分含量比较丰富,全磷含量亦高,在供试的土壤中全磷含量在0.129～0.25％,但有效磷缺乏,0.2N盐酸浸出磷只有全磷的0.27～0.45％。由于有效磷的供应不足,常成为生产上提高产量的主要限制因子。
Introduction Albic soil is the major arable land in the Sanjiang Plain of northeast China. Its area is nearly 10 million mu, accounting for about 60% of the current cultivated land area. The soil is developed in the Quaternary sediments of river and lake deposits. The nutrient content in the topsoil (black soil layer) is relatively abundant and the total phosphorus content is also high. The total phosphorus content in the soil tested is between 0.129 and 0.25%, but it is effective Phosphorus deficiency, 0.2N hydrochloric acid leaching phosphorus only 0.27 ~ 0.45% of total phosphorus. Insufficient supply of available phosphorus often serves as a major limiting factor in increasing production.