Effects of Root Growth of Deep and Shallow Rooting Rice Cultivars in Compacted Paddy Soils on Subsequent Rice Growth

作     者：Md.Dhin ISLAM Adam H.PRICE Paul D.HALLETT Dhin ISLAM;Adam H.PRICE;Paul D.HALLETT

作者机构：School of Biological SciencesUniversity of AberdeenSt Machar DrAberdeen AB243UUthe United Kingdom Faculty of AgricultureBangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur-1706Bangladesh 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2023年第30卷第5期

页      面：459-472,I0022-I0024页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：funded by the Commonwealth Scholarship Commission in the UK 

主　　题：plough pan root growth biopores crop rotation Oryza sativa preceding crop zero-tillage 

摘      要：Rice is often grown as multiple seasons in one year,alternating between flooded and upland systems.A major constraint,introduced from the flooded system,is a plough pan that may decrease rooting depth and productivity of follow-on upland *** penetrating the plough pan under flooded rice system can leave a legacy of weaker root growth *** rooting rice cultivars could have a bigger impact,but no direct evidence is *** explore whether a deep rather than a shallow rooting rice cultivar grown in a flooded cropping cycle benefited deeper root growth of follow-on rice in an upland,reduced tillage cropping cycle,a simulated flooded paddy in greenhouse was planted with deep(Black Gora) and shallow(IR64) rooting cultivars and a plant-free *** plough pans were made in between the topsoil and subsoil to form different treatments with no plough pan(0.35 MPa),soft plough pan(1.03 MPa) and hard plough pan(1.70 MPa).After harvest of this ‘first season’ rice,the soil was drained and undisturbed to simulate zero-tillage upland and planted rice cultivar BRRI Dhan *** overall root length density(RLD),root surface area,the numbers of root tips and branching of BRRI Dhan 28 did not vary between plough pan and no plough pan *** with the shallow rooting rice genotype,the deep rooting rice genotype as ‘first season’ crop produced 19% greater RLD,34% greater surface area and 29% more branching of BRRI Dhan 28 in the *** the topsoil,however,BRRI Dhan 28 had 28% greater RLD,35% greater surface area and 43% more branching for the shallow rather than deep rooting genotype planted in the ‘first season’.The results suggested that rice cultivar selection for a paddy cycle affects root growth of a follow-on rice crop grown under no-till,with benefits to subsoil access from deep rooting cultivars and topsoil proliferation for shallow rooting cultivars.