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用15N一标记肥料追踪油菜对肥料氮的吸收利用的试验结果表明,在盆栽条件下,基肥中各加施钾肥(30斤/亩)和ASU(脒基硫脲)处理的,油莱植株对15N一碳铵(作基肥)的利用率分别提高6.25%和7.06%;籽粒的利用率分别提高8.48%和8.09%;两者同时加施,全株和籽粒的利用率比单施15N一碳铵分别提高10.25%和12.33%,比单加施钾肥(30斤/亩)分别提高4.0%5和3.85%。基肥中分别加施钾肥和添加ASU处理的,基肥氮在籽粒中的分配比率分别比对照增加13.96%和11.60%,基肥中同时加施钾肥和ASU比单施碳铵增加17.11%。比碳铵加钾肥(15公斤/亩)增加3.15%,而其他器官特别是叶片的分配比率相应减少。可见适量钾肥和ASU均有利于基肥氮从营养器官向籽粒运转并提高油莱对基肥氮的利用率,两者同时加施,效果更佳,且对菜籽品质没有不良影响。
The results of using 15N-labeled fertilizer to track the uptake and utilization of fertilizer N by rape indicated that under potting conditions, the plants treated with potassium fertilizer (30 kg / mu) and ASU (guanylthiourea) The utilization rate of 15N ammonium bicarbonate (as basal fertilizer) increased by 6.25% and 7.06% respectively; the utilization rate of grain increased by 8.48% and 8.09% respectively; while the utilization rate of whole plant and grain was higher than that of 15N- Ammonium increased by 10.25% and 12.33% respectively, which was 4.0% and 3.85% higher than that of single K application (30 kg / mu). The basal fertilizer application of potassium fertilizer and addition of ASU treatment, the distribution ratio of basal fertilizer nitrogen in grains increased by 13.96% and 11.60% respectively compared with the control. The combined application of potassium fertilizer and ASU in basal fertilizer increased by 17.11% than the single application of ammonium bicarbonate. 3.15% more than ammonium bicarbonate plus potash (15 kg / mu), while the proportion of other organs, especially leaves, decreased accordingly. Apparent amount of potash fertilizer and ASU were beneficial to the conversion of basal fertilizer nitrogen from vegetative organs to grain and the utilization rate of nitrogen and nitrogen of basil fertilizer, both of which were better at the same time and had no adverse effect on the quality of rapeseed.