Comparison of no-tillage and conventional tillage in the development of sustainable farming systems in the semi-arid tropics

The results of 5 short-term (4-8 years) experiments and farm demonstrations in which no-tillage technology was compared with conventional or reduced tillage in the semi-arid tropics of the Northern Territory and Far North Queensland, during the mid 1980s to mid 1990s, are reviewed. In the Douglas-Daly and Katherine districts of the Northern Territory, dryland crops of maize, sorghum, soybean and mungbean sown using no-tillage with adequate vegetative mulch on the soil surface have produced yields comparable with, or higher than (especially in drier years), those obtained under conventional tillage. The importance of a surface mulch in ameliorating soil temperature, moisture and fertility, and in reducing soil movement and loss in crop production in the semi-arid tropics was confirmed. Management of mulch (pasture, crop residues and weeds) will be crucial in the application of no-tillage technology to the development of mixed dryland crop and livestock enterprises in the semi-arid tropics.

[1]  P. Saffigna,et al.  Nitrogen supply to no-tillage crops, as influenced by mulch type, soil type and season, following pasture leys in the semi-arid tropics , 1996 .

[2]  C. Martin.  Weed control in tropical ley farming systems: a review , 1996 .

[3]  Rattan Lai,et al.  Conservation Tillage for Sustainable Agriculture: Tropics Versus Temperate Environments , 1989 .

[4]  R. Lal,et al.  Effects of different mulch materials on soil properties and on the root growth and yield of maize (Zea mays) and cowpea (Vigna unguiculata) , 1981 .

[5]  R. Mccown,et al.  The Influence of Weather on the Quality of Tropical Legume Pasture during the Dry Season in Northern Australia. I Trends in Sward Structure and Moulding of Standing Hay at Three Locations , 1981 .

[6]  D. Butler,et al.  Following practices, soil water storage, plant-available soil nitrogen accumulation and wheat performance in South West Queensland , 1992 .

[7]  R. C. Muchow,et al.  Agro-research for the semi-arid tropics: North-West Australia , 1985 .

[8]  A. Chapman,et al.  Farming systems in the Australian semi-arid tropics-a recent history , 1996 .

[9]  Keith L. Bristow,et al.  Maize seedling response to the soil environment at varying distances from a mulched soil-bare soil boundary , 1990 .

[10]  W. Winter,et al.  Legume-based pasture options for the live cattle trade from the Australian semi-arid tropics , 1996 .

[11]  R. Isbell.  Australian Soil Classification , 1996 .

[13]  A. Webb,et al.  Tillage and crop residue management affect Vertisol properties and grain sorghum growth over seven years in the semi-arid sub-tropics. 3. Crop growth, water use and nutrient balance , 1990 .

[14]  A. Bengough,et al.  Hard-setting soils , 1987 .

[15]  D. Freebairn,et al.  Hydrologic effects of crop residue management practices , 1985 .

[16]  K. Bristow.  The Role of Mulch and its Architecture in Modifying Soil Temperature , 1988 .

[17]  A. Cogle,et al.  Soil organic matter changes and crop responses to fertiliser under conservation cropping systems in the semi-arid tropics of North Queensland, Australia , 1995 .

[18]  D. Abrecht,et al.  Coping with soil and climatic hazards during crop establishment in the semi-arid tropics , 1996 .

[19]  T. Knight,et al.  Long-term effects of conventional and no-tillage on selected soil properties and crop yields in Canterbury, New Zealand , 1993 .

[20]  R. Dalal,et al.  Long-term trends in fertility of soils under continuous cultivation and cereal cropping in southern queensland. ii* Total organic carbon and its rate of loss from the soil profile , 1986 .

[21]  Rattan Lal,et al.  No‐tillage Effects on Soil Properties under Different Crops in Western Nigeria , 1976 .

[22]  R. Jones,et al.  Short-term benefits of zero-tillage in tropical grain production. , 1980 .

[23]  B. Radford,et al.  Fallow management, soil water, plant-available soil nitrogen and grain sorghum production in south west Queensland , 1992 .

[24]  G. Hamilton,et al.  Soil physical and chemical changes due to tillage and their implications for erosion and productivity , 1993 .