Tillage and plastic mulch effects on soil properties and growth and yield of cocoyam (Colocasia esculenta) on an ultisol in southeastern Nigeria

Abstract Protected cultivation, mainly represented by plastic-film mulching, has greatly improved crop production worldwide since the 1950s. However, despite its widespread use in tropical USA, Europe and China, its use in sub-Saharan Africa is not widespread. A field experiment was conducted using cocoyam ( Colocasia esculenta L. Schott) to evaluate the effects of two tillage systems (tilled and no-till) and plastic-film mulch (black and clear plastic-film mulch) on soil properties and cocoyam growth and yield in 2003 and 2004 planting seasons on a Typic paleudult in southeastern Nigeria. The experiment comprised six treatments and was laid out in the field using randomized complete block design replicated three times. Results showed that 70–80% of the corms emerged 7–8 days (21 days after planting [DAP]) earlier in both tilled and no-till plastic-film mulched plots when compared to the unmulched plots. At later stages of crop development, the plants in the tilled black plastic-film mulched plots were taller by 61–67% than those in the unmulched no-till plots, which had the lowest plant height (27–30 cm). At 98 DAP, there were no significant treatment differences in leaf area index (LAI) between tilled and no-till mulched plots with LAI of 15.5–19.8. However, LAI was reduced in both unmulched plots by 35–54% when compared to the mulched plots. On the average soil temperature was higher in plastic-film mulched plots than that under plots without mulch by about 2 °C. Results show significantly lower soil bulk density (between 1.10 and 1.26 Mg m −3 ) in both tilled clear and black plastic-film mulched plots when compared to the corresponding no-till clear or black plastic-film mulched plots (1.40–1.45 Mg m −3 ). For the two seasons studied volumetric water content (VWC) in tilled black plastic-film mulched plots were significantly higher than VWC in other mulched plots by between 10 and 38% in 2003 and between 17 and 30% in 2004. At harvest (270 DAP) the highest corm yield was obtained in tilled black plastic mulched plots (29.1 Mg ha −1 ). This was higher ( P  = 0.05) than yields obtained in no-till, no mulch plots by 72%. Yields were also higher in tilled black plastic mulched plots when compared to tilled clear plastic mulched plots, no-till black plastic mulched plots and no-till clear plastic mulched plots by 29, 47 and 59%, respectively. These findings suggest that plastic mulched plots provide a better soil environment for cocoyam than unmulched plots and that tilled mulched plots especially tilled black plastic mulched plots provide superior edaphic environment for cocoyam when compared to other treatments used.

[1]  V. Arora,et al.  Intensive Cropping: Efficient Use of Water, Nutrients, and Tillage , 2000 .

[2]  D. W. Nelson,et al.  Total Carbon, Organic Carbon, and Organic Matter , 1983, SSSA Book Series.

[3]  I. Onwueme Taro cultivation in Asia and the Pacific , 1999 .

[4]  A. M. Al-Darby,et al.  Seed zone soil temperature and early corn growth with three conservation tillage systems , 1987 .

[5]  S. Henley,et al.  Book reviewPrinciples and procedure of statistics: A biometrical approach: R. G. D. Steel and J. H. Torrie. McGraw-Hill, New York. 2nd Edit., 1980. 633p. , 1983 .

[6]  Satish C. Gupta,et al.  CORN EMERGENCE AS INFLUENCED BY SOIL TEMPERATURE, MATRIC POTENTIAL, AND AGGREGATE SIZE DISTRIBUTION. , 1985 .

[7]  J. Doran,et al.  Effect of water-filled pore space on carbon dioxide and nitrous oxide production in tilled and nontilled soils [Maize; Illinois; Kentucky; Minnesota; Nebraska] , 1984 .

[8]  James H. Torrie,et al.  Principles and procedures of statistics: a biometrical approach (2nd ed) , 1980 .

[9]  V. Arora,et al.  Tillage for Sustainable Cropping , 2002 .

[10]  D. W. Nelson,et al.  Total Carbon, Organic Carbon, and Organic Matter 1 , 1982 .

[11]  I. C. Onwueme,et al.  Field crop production in tropical Africa , 1991 .

[12]  M. Anikwe,et al.  Modulating Effect of Black Plastic Mulch on the Environment, Growth and Yield of Cassava in a Derived Savanna Belt of Nigeria , 2004 .

[13]  J. Monteith,et al.  Measurements of the heat balance under plastic mulches. Part I. Radiation balance and soil heat flux , 1986 .

[14]  B. D. Soane,et al.  Soil compaction in crop production , 1994 .

[15]  B. C. Ball,et al.  Effects of compaction on soil aeration properties. , 1994 .

[16]  M. Obi,et al.  Effect of crop and soil management practices on soil compatibility in maize and groundnut plots in a Paleustult in Southeastern Nigeria , 2003, Plant and Soil.

[17]  Feng-Min Li,et al.  Effects of clear plastic film mulch on yield of spring wheat , 1999 .

[18]  N. Tovey,et al.  Effects of Compaction on Soil Microstructure , 1994 .

[19]  D. J. Watson,et al.  The Dependence of Net Assimilation Rate on Leaf-area Index , 1958 .

[20]  L. Brussaard,et al.  Effects of compaction on soil biota and soil biological processes. , 1994 .

[21]  E. O. Mclean Soil pH and Lime Requirement , 1982 .

[22]  J. Ellis Post Flood Syndrome and Vesicular‐Arbuscular Mycorrhizal Fungi , 1998 .

[23]  G. Gee,et al.  Particle-size Analysis , 2018, SSSA Book Series.