Table 1.
Overview of experimental conditions of the field trials conducted at Kyela, Tanzania (2011 and 2012), and at Mbita, Kenya (2010 and 2011).
| Location | Kyela–Tanzania (S. asiatica) | Mbita–Kenya (S. hermonthica) | |||
|---|---|---|---|---|---|
| (9°37′30′′ S–33°52′30′′E) | (0°42′82′′ S–34°20′53′′ E) | ||||
| Altitude (m a.s.l.) | 525 | 1141 | |||
| Year | 2011 | 2012-1 | 2012-2 | 2010 | 2011 |
| Season/Period | Single rain/Feb–Jun | Short rain/Sep–Jan | Long rain/Mar–Aug | ||
| Cumulative rainfall (mm) | 2474 | 2499 | 281a | 615 | |
| Sowing dates | 09/02/211 | 22/02/2012 | 29/02/2012 | 17/09/2010 | 17/03/2011 |
| Cultivars | 24 + Mwangulu | 24 + IR49255-B-B-5-2 | |||
| Net plot size (m2) | 117.25 m2 | 86 m2 | |||
| Net sub-plot size (m2) | 4.69 m2 | 3.44 m2 | |||
| Fertilizer application | 100 kg ha−1 N-P-K: 20-10-10 | 50 kg ha−1 N-P-K: 17-17-17 | |||
| Striga infestation density (m−2) | 0.91 g (243,000 seedsb) | 0.60 g (85,000 seeds) | |||
| Soil parameters | |||||
| Sand:silt:clay | 63:14:23 | 63:14:23 | 63:13:25 | – | – |
| pH | 5.21 | 4.80 | 4.75 | 5.70 | 5.95 |
| N (%) | 0.10 | 0.11 | 0.11 | 0.60 | 1.46 |
| P (ppm) | 4.11 | 6.8 | 5.9 | – | – |
| K (ppm) | 230 | 218 | 229 | – | – |
a
Supplementary irrigation was provided.
b
Seed weights according to Parker and Riches (1993).