Table 5.
Comprehensive quality index, soil salt content in plough layer, and tomato yield.
| Treatment | Comprehensive quality index | Salt in plough layer (g kg−1) | Tomato yield (t hm−2) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 2011 | 2012 | 2013 | 2011 | 2012 | 2013 | 2011 | 2012 | 2013 | |
| CK | 3.014 | 2.872 | 2.617 | 1.47 | 1.46 | 1.27 | 103.84 | 108.68 | 112.47 |
| Straw mulching | 1.000 | 1.000 | 1.713 | 1.10 | 0.82 | 0.64 | 136.56 | 145.73 | 157.22 |
| Soil structure conditioner | 1.757 | 1.554 | 1.000 | 1.23 | 0.96 | 0.71 | 122.39 | 139.28 | 134.55 |
| Water-retaining agent | 2.339 | 1.830 | 1.956 | 1.55 | 1.39 | 1.13 | 128.96 | 135.47 | 145.71 |