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本试验结果表明:1、玉米在第2叶、高梁在第1叶期便对外源养分有较大的吸收,且随供氮水平提高,吸氮增加,吸磷、钾在2N范围内也增加。2、外源养分及适当的供氮水平明显地提高了二作物1叶后的根系生长和干物质积累速度。3、供外源养分时,玉米离乳叶龄增大,高粱3叶后不再消耗胚乳养分,故认为其自养生长的建立不应完全以胚乳物质的消耗来衡量。4、二作物幼苗期的供氮浓度以40—80ppm为佳,高氮(120ppm)是不利的。且应保证1叶期左右有外源养分的供应。
The results showed as follows: 1. In the second leaf of maize, sorghum had a greater absorption of exogenous nutrients at the first leaf stage. With the increase of nitrogen supply, the nitrogen uptake increased and phosphorus uptake and potassium increased within 2N . Exogenous nutrients and appropriate nitrogen levels significantly increased the root growth and dry matter accumulation rate of the second crop after one leaf. 3, for exogenous nutrients, maize leaves age increased, after 3 leaves of sorghum is no longer consumed endosperm nutrients, it is believed that the establishment of self-supporting growth should not be completely measured by the consumption of endosperm material. 4, two crops seedling nitrogen concentration of 40-80ppm is better, high nitrogen (120ppm) is unfavorable. And should ensure that there is a supply of exogenous nutrients around the leaf stage.