Research On No-till Post-paddy Wheat Seeding Technologies And Its’effect

Rational no-till seeding technology provides optimum growth environment for post-paddy wheat.Therefore,post-paddy wheat performance is a key parameter that can be applied for assessing the suitability of seeding technologies.A number of seeding technologies are available for post-paddy wheat seeding in China.But researches on seeding technologies are scattered and lack systematic assessment.In addition,most of the developing efforts were focused on machine design,with little concern on the field conditions of the field seeding environment.It is therefore unable to explain whether a seeding technology is suitable or not with no crop performance as a reference,when a seeding technology is to be evaluated.The worst case is that the proposed seeding technology leads to poor crop performance and even endangers crop yield,making the widespread extension of the technology impossible.The effect of several precision seeding technologies on post-paddy wheat performances was investigated.A seed-zone micro-climate detector was constructed and used for monitoring the micro-climate of wheat seed been planted with several seeding technologies.Also crop root architecture reconstruction technology and digital image processing were used to quantify both wheat root system and wheat leaves.This allows a correct assessment of the suitability of seeding technologies.Based on a thorough overview on the available technologies for seeding post-paddy wheat,3 precision seeding technologies,i.e.no-till precision broadcasting,no-till drill and no-till punch-seeding,were selected for field experiment.Also,these 3 seeding methods were compared with the traditional seeding technology.The result showed that the constructed experimental equipments can satisfy the experimental requirements on single-seed planting.To quantify the seed germinating environment under different seeding technologies,the constructed microclimate detector was used to monitor the seed-zone temperature and humidity,which were then used to evaluate the microclimate properties under different seeding methods.The result showed that the constructed system is stable,low in cost and power demand,and easy for maintenance,being suitable for field scale applications.The constructed seed-zone microclimate detector was used for monitoring the seed-zone microclimate,which result was used to evaluate the reasonability of different seeding technologies and their effect on seed germination and seedling standing.The result showed that,under surface broadcasting,the exposed seed in the field underwent severe variations of the microclimate,leading to a reduced germination rate.Compared with this,no-till drilling and no-till punch-seeding provided an ambient seed-zone microclimate,which resulted into a higher germination rate.It was also found that,under traditional seeding method,the wet paddy soil resulted into larger soil clods,leading to enhanced variation of the microclimate,lower germination rate and a slower seedling growth rate.To further quantify the crop growth performance under different seeding methods,wheat root reconstruction and seedling scanning technologies were used to quantify wheat growth performances.The result showed that different seeding technologies do affect wheat root competition,which further affects wheat root development in the side directions.Post-paddy wheat under straw cover revealed a weak state of growth,showing a higher but thin seedling condition with longer leaves.But with the progress of the seedling growth this weak condition disappeared.Instead,a better performance of wheat seedling appeared,e.g.stronger stem,thick leaves and good appearance.