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Northwest A&F University (2020)

Effects of Ridge and Furrow Structure and Nitrogen Application on Water and Nitrogen Utilization of Maize in Semi-arid Region

李方剑

Titre : Effects of Ridge and Furrow Structure and Nitrogen Application on Water and Nitrogen Utilization of Maize in Semi-arid Region

Auteur : 李方剑

Grade : Master’s Theses 2020

Université : Northwest A&F University

Résumé partiel
In the semi-arid area of the Loess Plateau,corn is one of the main food crops.The ridge and furrow semi-mulch planting has been widely used in this area because of its function of collecting rain and protecting moisture and greatly increasing crop yield.Applying nitrogen fertilizer at an appropriate time can not only meet the nitrogen demand of crops,but also obtain higher nitrogen fertilizer utilization efficiency and reduce nitrogen loss.In this study,three corn planting methods(CK:flat cropping without mulching ;RF1:ridge ratio furrow60cm:40cm ;RF2:ridge ratio furrow 60cm:60cm)and three different nitrogen application periods were set up(A:Nitrogen fertilizer before sowing 230kg·hm-2 ;J:Nitrogen fertilizer before sowing 115kg·hm-2+Nitrogen fertilizer at jointing stage 115kg·hm-2 ;B:Nitrogen fertilizer before sowing 115kg·hm-2+Nitrogen fertilizer in big trumpet stage 115kg·hm-2).Through comprehensive evaluation of field planting methods and nitrogen application periods for two consecutive years(2018~2019)on farmland soil moisture,water consumption characteristics,corn growth,soil nitrogen,yield,water use efficiency and nitrogen use efficiency.Clarify the suitable planting management methods and nitrogen application periods in the semi-arid areas of the plateau in the Loess Plateau of China.Verification hypothesis"Are farmland production,water and nitrogen utilization efficiency and economic benefits effectively increased with increasing planting costs".It provides a theoretical basis for formulating effective cultivation and nitrogen management measures in the region.The following results were obtained in this study:1. The jointing period to the flowering period is a critical period of water demand for corn. During this period,rainfall will effectively improve the soil moisture status to avoid soil desiccation and meet crop water requirements.The sum of the soil water storage in the corn jointing stage and the precipitation from the jointing stage to the flowering stage has a strong correlation with the yield,which can predict the corn yield.The ridge and furrow semi-mulch planting builds furrows in the field,which can effectively collect rainfall,reduce water evaporation,improve soil moisture status before corn sowing to jointing,and promote crop growth.In the case of less precipitation from the sowing of corn to flowering,the ridge and furrow half-mulch film planting has a greater yield increase benefit ;

Mots clés : ridge and furrow semi-mulch ;nitrogen application period ;furrow pattern ;water use efficiency ;nitrogen use efficiency ;

Présentation (CNKI)

Page publiée le 29 mars 2022