Farmers’ intentions to adopt Triple S for sweetpotato seed conservation

Figures & data

Figure 1. The Triple S: storage in sand, sprouting and planting out. Explanatory drawing from extension literature for farmers. Source: Stathers et al., 2017.

Figure 2. Theory of planned behavior and technology acceptance model (TPB-TAM) framework extended with knowledge, gender norms, agency and implementation intention (II).

Figure 3. Map of Uganda showing study districts.

Table 1. Content validity and internal consistency of the model constructs.

	Composite reliability	Cronbach’s alpha	AVE
Perceived usefulness (PU)	0.77	0.80	0.54
Perceived ease of use (PEOU)	0.84	0.85	0.63
Subjective norms (SN)	0.83	0.86	0.62
Behavioral intentions (BI)	0.76	0.80	0.61
Gender norms	0.89	0.90	0.60
Attitude	0.72	0.78	0.50
Perceived behavioral control (PBC)	0.72	0.78	0.50
Agency	0.70	0.64	0.51
Knowledge	0.70	0.66	0.50

Table 2. Socio-economic characteristics of survey respondents.

Variable	Full Sample (n = 255)	Users (n = 132)	Non-Users (n = 123)	P-values
Age	40.93 (14.29)	40.98 (13.48)	40.89 (15.16)	0.960
Education (years)	6.39 (3.67)	6.54 (3.63)	6.24 (3.71)	0.508
Household size	7.13 (2.71)	7.30 (2.48)	6.96 (2.94)	0.323
Experience in sweetpotato production (years)	17.19 (15.41)	18.07 (17.72)	16.25 (12.46)	0.342
Distance to all weather road (minutes)	18.91 (29.42)	18.92 (27.59)	18.90 (31.44)	0.996
Distance to market center (minutes)	60.03 (58.10)	65.34 (60.48)	54.34 (55.11)	0.132
Distance to agricultural extension (minutes)	126.15 (91.01)	114.68 (58.82)	138. 63 (115.46)	0.068
Total household income	**1,102,366 (1,262,510)	1,372,874 (1,350,294)	812,066 (1,093,880)	0.000
Income from sale of vines and roots	22,780.39 (38,812.17)	36,265.15 (44,261.18)	8,308.94 (24,803.86)	0.000

* SD in parentheses, **1USD = 3,748 UGX as at January 2019 (OANDA).

Table 3. Summary statistics of model constructs.

Construct	Full Sample (n = 255)	Users (n = 132)	Non-Users (n = 123)	P-values
Perceived usefulness (PU)	4.13 (0.60)	4.42 (0.44)	3.82 (0.60)	0.000
Perceived ease of use (PEOU)	4.02 (0.81)	4.40 (0.59)	3.62 (0.83)	0.000
Attitude	3.95 (0.65)	4.29 (0.50)	3.59 (0.60)	0.000
Subjective norms (SN)	3.81 (0.66)	4.08 (0.60)	3.52 (0.61)	0.000
Perceived Behaviour Control ()PBC	3.70 (0.84)	4.16 (0.62)	3.21 (0.78)	0.000
Behavioral intensions (BI)	4.06 (0.75)	4.42 (0.60)	3.68 (0.70)	0.000
Gender norms	3.84 (0.63)	3.93 (0.62)	3.71 (0.63)	0.171
Agency	3.85 (0.70)	4.08 (0.64)	3.59 (0.68)	0.000
Knowledge	3.48 (0.70)	3.42 (1.10)	3.54 (1.25)	0.420
Implementation Intention (II)	4.42 (1.02)	4.84 (0.55)	3.97 (1.20)	0.000

* SD in parentheses.

Figure 4. Theory of planned behavior and technology acceptance model (TPB-TAM) extended framework showing results of the multi-group analysis.

Figure 5. Determinants of implementation intention (II) mediated by farmers’ gender.

Stathers, T., Namanda, S., Agili, S., Cherinet, M., Njoku, J., & McEwan, M. (2017). Guide for trainers – sweet potato planting material conservation triple S method: Sand, storage, sprouting (p. 42). International Potato Centre, Nairobi, Kenya.

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Data availability statement

The data that support the findings of this study are available from the International Potato Center (CIP) but restrictions may apply to the availability of these data, which were used under licence for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of CIP.