A study of the growth and yield of cassava (Manihot esculenta Crantz) when grown as a perennial crop

Hall, John Richard. (1984). A study of the growth and yield of cassava (Manihot esculenta Crantz) when grown as a perennial crop Master's Thesis, School of Land, Crop and Food Sciences, The University of Queensland.

       
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Author Hall, John Richard.
Thesis Title A study of the growth and yield of cassava (Manihot esculenta Crantz) when grown as a perennial crop
School, Centre or Institute School of Land, Crop and Food Sciences
Institution The University of Queensland
Publication date 1984
Thesis type Master's Thesis
Supervisor Dr. Shu Fukai
Total pages 59
Language eng
Subjects 07 Agricultural and Veterinary Sciences
Formatted abstract Four cassava varieties of different growth habit, M AUS 7, M AUS 10, M' AUS 19 and SM1~150 were grown for periods of one, two and three years at Redland Bay, South East Queensland and examined on three harvest occasions in the last year of each crop for total dry matter production and dry storage root yield.

Extending the period of growth from one to three years significantly increased both total dry matter (TDM) and dry storage root yields. The exceptionally dry weather prevailing in the December - April period compromised the yield results particularly for the second and third year treatments, while the first year crop under periodic irrigation produced a high yield for this environment.

The mean storage root yield at the end of the third year represented an increase of 79% over the first year trial yield, but at the end of the second year, mean storage root yield was lower than that of the first year. Low harvest indices in the second and third year crops were caused by loss of storage root weight between December and February.

The locally collected variety, M AUS 7 was an outstanding perennial crop because of its higher crop growth rate (CGR) through~ out the experimental period and higher harvest index. M AUS 10 had high TDM but lower harvest indices in the second and third years which resulted in medium economic yields. The introduced variety SM1 -150 had lower TDM but with high harvest index accomplished reasonable economic yields although these were affected by loss of storage roots due to rotting in the third year. M AUS 19 had low TDM and low harvest indices resulting in poor storage root yields in both the first and second years with its eventual demise in the third year due to fungal disease.

Leaf area indices were generally higher in the two and three year treatments compared to those for the one year plants at the first harvest associated with high CGR whilst moisture conditions remained favourable.

Decline of leaf area indices in the second and third year treatments from December were associated with moisture stress. Lower levels of light were intercepted by the two and three year crops than for the one year crop at comparable levels of LAI probably because of more clumped foliage arrangement and the distribution of leaf area being over a greater height in the former.


Keyword Crop yields
Growth (Plants)
Cassava -- Queensland -- Redland Bay
Additional Notes

Spine title: Growth and yield study of a perennial cassava crop.

 
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