Wednesday, November 7, 2007
297-10

Study on the Effects of N Forms Applied on Sugar Beet Resistance to the N Stress.

Shao-ying Pan, Agricultural products testing center of Heilongjiang, Haerbin, China, Limin Shao, Heilongjiang Administrative College, Haerbin, China, Jiming Li, Environmental monitoring center of Heilongjiang, Haerbin, China, Shi Mei Wu, Institute of Hangguo, Hangzhou, China, and Shanmei Wu, Nanjing Agricultural University, Berkeley, CA 94705.

The resistance to N stress in different sugar beet genotypes was studied by using soil pots and liquid cultures. results showed that: 1. surgar beet had versatile reactions to N stress. The difference of resistance to N stress ranged from 2-6 times among treatments; 2. N forms applied had a great effect on sugar beet resistance to N stress for the six varieties (lines) studied. They had a higher resistance to NH4-N stress, and also showed a higher resistance to NO3-N + NH4-N mixed forms; 3. Different N forms regulated N uptake character in surgar beet, but the reactions of different genotypes showed large differences to NO-N, NH4-N and NO3-N + NO3-N mixture stress; 4. The index of the sugar beet resistance to N stress positively correlated with leaf area, chlorophyll and total N content.

Key words: N forms, N stress, Resistance, Sugar beet


Back to Nitrogen and Crop Response (includes Graduate Student Competition)
Back to S04 Soil Fertility & Plant Nutrition

Back to The ASA-CSSA-SSSA International Annual Meetings (November 4-8, 2007)