Abstract: In order to study the effects of different nitrogen forms (ammonium, as A; nitrate, as N; ammonium and nitrification inhibitor dicyandiamide, as A+DCD) on growth and nutrient absorption of rice plants under non-flooded cultivation at the tillering and booting stages, a pot experiment with different forms of nitrogen fertilizer was conducted in greenhouse. The results showed that at the tillering and booting stages, biomass, number of tillers and the area of newly expanded leaves of rice plants under A and A+DCD treatments were higher than those under N treatment; The highest net photosynthetic rate occurred in rice plants under A+DCD treatment, and the lowest under N treatment; The proportion of potassium distributing in leaves of rice plants under A and A+DCD treatments was higher than that under N treatment, while the proportion of potassium distributing in stems of rice plants under N treatment was higher than that under A and A+DCD treatments.

Key words: nitrogen form, non-flooded cultivation, rice, biomass, nutrient absorption

摘要： 采用土培试验种植旱作水稻，研究铵态氮（A）、硝态氮（N）和铵态氮加硝化抑制剂（A+DCD）对旱作水稻分蘖期、孕穗期生长和养分吸收的影响。在分蘖期和孕穗期，铵态氮和铵态氮加硝化抑制剂处理的水稻各部位生物量、分蘖数及新完全展开叶的叶面积均较硝态氮处理的高；铵态氮加硝化抑制剂处理的水稻叶片净光合速率最高，硝态氮处理的水稻叶片净光合速率最低； 铵态氮和铵态氮加硝化抑制剂处理的水稻体内的钾向叶片中分配比例较高，而硝态氮处理的水稻向茎秆中分配的比例较高。

关键词: 供氮形态, 旱作, 水稻, 生物量, 养分吸收