摘要
采取盆栽试验、田间小区试验、大田生产性检验及室内分析相结合的方法,研究了湖北省平原潮土地区棉麦两热制下棉花亩产籽棉150～250kg的氮营养诊断时期、诊断指标及氮肥经济用量,结果表明:施氮水平与籽棉产量、功能叶片全氮、非蛋白氮、氨基态氮、叶柄硝态氮、可溶性糖及淀粉等有很好的相关性与重现性;棉花氮营养诊断的最适宜时期为见蕾期和见花期;棉花氮营养诊断的临界指标,见蕾期功能叶片全氮>4.0%,非蛋白氮>0.825%,氨基态氮<100mg·100g^(-1)(干)左右,叶柄硝态氮>20000ppm(干),可溶性糖<5.0%,C/N比值1.7～2.0;见花期功能叶片全氮>3.5%,非蛋白氮>0.825%,氨基态氮>100mg·100g^(-1)(干),叶柄硝态氮>10000ppm(干),可溶性糖<5.0%,C/N比值1.5～1.7;亩产籽棉150～250kg的经济施氮量为12～15kg纯氮。
Pot and field experiments of cotton were conducted on the soils of alluvial deposits (Fluvent) in Hubei Province. The study focused on the optimum N application to obtin a yield 150-250kg per mu of unginned cotton under the cotton-wheat rotation system, o search a suitable time, economical rate, and index in nitrogen nutrition diagnosis. he results as follows.
1 . There was a close correlations and well reappearances between the nitrogen evels and yields, total-N, nonprotein-N, amino-N, soluble sugar, starch in functional eaves, topmost mature leaves, and NO_3-N in petioles.
2. The optimum N diagnosis periods were obtained at the time of early square and arly flowering stage.
3. N diagnostic criteria at early square stage were suggested as total-N 4.0%, nonprotein-N 0.825%, NO_3-N 20000ppm (DM), amino-N 1000ppm , soluable sugar 5.0%, and C/N ratio 1.7-2.0. At early flowering stage were total-N 3.5%, nonptotein-N 0.825%, amino-N 1000ppm, NO_3-N 10000ppm(DM), soluble sugar 5.0% and C/N ratios 1.5-1.7.
4. The most economical efficient rate of 12-15kg N per mu were suggested to produce 150-250 kg per mu of unginned cotton in this ares.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1989年第S1期99-105,共7页
Journal of Huazhong Agricultural University
基金
农业部农业局经作一处下达项目
