Table 4.
The number of chemical fertilizers in mango cultivation in southern Vietnam.
| Items | Season 1 | Season 2 | Season 3 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Non-coop. (n = 361) | Coop. (n = 285) | t -test | Non-coop. (n = 415) | Coop. (n = 262) | t-test | Non-coop. (n = 292) | Coop. (n = 271) | t -test | |
| Root fertilizer | |||||||||
| N (kg) | 294.9 | 215.1 | ∗∗ | 251.0 | 189.0 | ns | 49.2 | 146.7 | ∗∗ |
| P (kg) | 201.5 | 159.0 | ns | 190.0 | 130.0 | ns | 43.4 | 116.8 | ∗ |
| K (kg) | 171.3 | 163.2 | ns | 163.1 | 161.5 | ns | 35.7 | 99.1 | ∗∗ |
| Microelements (gr) | 27.9 | 35.7 | ns | 5.7 | 82.9 | ns | 0.5 | 40.9 | ns |
| Leaf fertilizer (liquid) for flowering stimulation | |||||||||
| N (kg) | 8.0 | 7.5 | ns | 8.1 | 6.0 | ∗∗ | 6.4 | 4.6 | ∗∗ |
| P (kg) | 2.8 | 1.0 | ∗∗ | 2.6 | 0.7 | ∗∗∗ | 2.5 | 0.5 | ∗∗∗ |
| K (kg) | 13.1 | 13.1 | ns | 12.3 | 10.4 | ns | 8.5 | 8.7 | ns |
| Microelements (gr) | 58.4 | 37.5 | ns | 124.6 | 52.8 | ∗∗∗ | 110.5 | 61.2 | ns |
Source: Field Survey Data, 2018. Unit: kg/ha. ∗ Significant at the 10% level, ∗∗ significant at the 5% level, ∗∗∗ significant at the 1% level, and ns: nonsignificant.