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摘要
A alta exig那ncia de nitrog那nio pela cultura do trigo faz que o estudo de doses em diferentes cultivares tenha elevada importancia. As doses estudadas foram 0, 30, 60, 90 e 120 kg ha-1 de N, na forma de ur谷ia, aplicada em cobertura em 4 cultivares de trigo (IAC 24, IAC 364, IAC 370 e IAC 373), com 4 repeti es. O solo 谷 um Latossolo Vermelhodistr車fico argiloso, irrigado por um sistema de piv central. O comprimento de espigas e o n迆mero de espiguetas por espiga aumentaram significativamente com as doses de N; as doses de N aumentaram o teor de N foliar, o n迆mero de espigas por metro, a massa de 100 gr os e a produtividade de gr os at谷 a dose de 77, 74, 68 e 70 kg ha-1 de N, respectivamente. Recomenda-se, visando a produtividade de gr os, a aplica o de 70 kg ha-1 de N, em cobertura, independentemente da cultivar a ser utilizada. The high demand of nitrogen for wheat crop increases the importance of the study of doses to different wheat cultivars. The studied doses were 0, 30, 60, 90 and 120 kg ha-1 as urea at side dressing in 4 wheat cultivars (IAC 24, IAC 364, IAC 370 and IAC 373) in 4 replications. The soil is a Red loamy dystrophic Latosol (Haplustox),irrigated by a sprinkler system. The length of spikes and the spikelets number for spikes increased significantly with N doses; the doses of N increased leaf N content, the spikes number for meter, the mass of 100 grains and the grain yield up to 77, 74, 68 and 70 kg ha-1of N, respectively. It is recommended, seeking the productivity of grains, the application of 70 kg ha-1 of N, at side dressing, to any cultivar.
