分层施肥对小麦植株含N量的影响

对平作表层(1～2cm)土层施肥与垄作表层(1～2cm)、中层(25cm)、底层(45cm)土层施肥时的小麦不同生育时期各器官含N量的研究结果表明:无论是垄作还是平作表层施肥,小麦从三叶期到拔节期根、叶的含N量由高到低;而垄作中层和底层施肥却由低到高。三叶期时根、叶含N量以表层施肥>中层施肥>底层施肥。而表层施肥的垄作与平作间对比,则根叶的含N量无显著差异,三叶期以后小麦根、茎、叶、粒、壳的含N量影响不大。另外,垄作底层,中层施肥比表层施肥显著增加了小麦产量。

RESEARCH OF WHEAT''''S NITROGEN CONTENT AS INFLUENCE BY LAYER MANURING

This study the Nitrogen content of wheat organs in different growing periods was carried out in fertilizer opplications (flat planting application at 1 - 2cm in soil layer depth, and mound planting application at 1-2cm,25cm,45cm in soil layer depth). The conclusions were drawn as follows :from three-leaves period to shooting period,the Nitrogen content of wheat' s roots and leaves is ranged from high to low for the surface application of both planting methods; but the case was just contrary for the middle layer and the bottom layers applicaation of mound planting application. In the three leaves period, the Nitrogen content of wheat' s roots and leaves was increased by the surface application much or considerably more than by the middle layer application. The same result can be gotten between the middle layer application is compared with the bottom layer application. However, there is no obvious difference of Nitrogen content of wheat' s roots and leaves for the surface application of both planting methods. For the wheat plants in three leaves period and growth period after wards, different application methods have no notable influnce on the Nitrogen content of the roots, stems, leaves, grains and shells.