Influence of moisture and allelopathic regimes in the soil on the development of cassava and mycorrhizal infection of its roots during establishment period
1997
Agili, S.M. | Pardales, J.R. Jr. (Visayas State Coll. of Agriculture, Baybay, Leyte (Philippines). Philippine Root Crop Research and Training Center)
Soil moisture regime had highly significant effect on the shoot development of cassava. Moisture content equivalent to 30 percent of the field capacity (30 percent FC) of the soil used significantly reduced plant height, number of leaves and shoot fresh and dry weights of the plants when compared with those under soil moisture contents of 80 percent FC or 100 percent FC. In contrast with the higher moisture regimes, 30 percent FC significantly inhibited the mycorrhizal root infection in cassava and reduced the total length and total dry weight of mycorrhiza-infected roots. The number and length of the different root system components of cassava were generally reduced by the low moisture regime. An increase in soil moisture from 30 percent FC to 80 percent FC numerically increased the number of the different root system components including the total length of the adventitious roots. Further increase in moisture from 80 percent to 100 percent FC caused relative reduction in the total length of the first and second order lateral roots. The shoot development parameters of cassava were highly retarded by the allelopathic regime in the soil. Mycorrhizal root infection and the total length and dry weight of the mycorrhiza-infected roots were also significantly decreased by allelopathy. This factor, however, did not have significant influence on the number and total length of the adventitious roots and their attendant laterals. The length of the longest root, root volume and root dry biomass which were highly affected by moisture regime were not markedly influenced by allelopathy although under alelopathic regime the value of the different root parameters were generally reduced
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