Effect of some bio-fertilizers on growth, productivity, chemical composition and processing of cassava tubers

الملخص EN

Three types of bio- fertilizers along with the control were investigated in the present study to clarify their effects on vegetative growth and yield parameters of cassava cultivated at the two successive seasons 2014/2015 and 2015/2016.

Moreover, Bio- fertilized cassava tubers along with counterpart control of the second season (2015/2016) were analyzed for the chemical composition, minerals, polyphenols and vitamin C along with estimation of organoleptic properties of boiled and fried cassava.

The three types of bio fertilizer treatments included mixed algae (CMA), mixed algae extract (CMAE), and mixed bacteria (CMB) compared with the control treatment (CC).

Results significantly revealed the highest values of the following parameters, in both growing seasons each in turn: plant height (CC, CMA and CMB); dry weight of plant (CC), total yield/plant (CC, CMA) tuber number plant (CC), tuber weight (CMA) and total yield/fed (CC) and (CMA).

Cassava bio fertilized with mixed algae extract (CMAE) recorded the highest mean value of dry matter and the lowest moisture content.

Meanwhile, the control sample (CC) exhibited the highest mean values in protein and crude fibers and CMA sample represented the highest content of fat and ash.

Nitrogen free extract showed the highest content with CMAE and CMB samples.

All studied cassava samples had a considerable amount of vitamin C ranged from 49.17 to 65.62 mg/100g dry weight whereas the highest amount was found in CMB sample followed by CC, CMA and CMAE, respectively and slightly little amount of polyphenols (42.27 - 67.35 mg/100g dry weight) and they were found in the highest amount in CC followed by CMB, CMA and CMAE samples respectively.

All studied cassava samples are considered as good source of potassium whereas it ranges from 462.40 to 559.36 to mg/ 100g dry weight.

Both fried and boiled products prepared from the studied cassava tubers were highly accepted by panelists.