Table 13.
Effect of crop establishment techniques and nutrient management options on zinc (Zn) (DTPA-extractable) (g ha–1) content in soil in RWCS.
| Treatment | Initial DTPA-extractable Zn | Zn applied through fertilizer | Total initial available Zn present in soil | Cropping system Zn uptake | Balance after completion of cropping cycle | Actual available Zn present in soil after completion of cropping cycle | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013–14 | 2014–15 | 2013–14 | 2014–15 | 2013–14 | 2014–15 | 2013–14 | 2014–15 | 2013–14 | 2014–15 | 2013–14 | 2014–15 | |
| Crop establishment techniques | ||||||||||||
| PTR–CDW | 1904.0 | 3732.9 | 2222.2 | 2222.2 | 4126.2 | 5955.1 | 741.0 | 691.6 | 3385.3 | 5263.5 | 3732.9 | 3773.9 |
| SRI–SWI | 1904.0 | 3729.4 | 2222.2 | 2222.2 | 4126.2 | 5951.6 | 745.7 | 696.4 | 3380.5 | 5255.2 | 3729.4 | 3771.2 |
| ARS–ZTW | 1904.0 | 3538.4 | 2222.2 | 2222.2 | 4126.2 | 5760.6 | 764.1 | 709.9 | 3362.2 | 5050.6 | 3538.4 | 3124.0 |
| SEm ± | - | 2.91 | - | - | - | 2.91 | 4.59 | 2.66 | 4.59 | 5.53 | 2.91 | 3.74 |
| CD (P = 0.05) | - | 11.44 | - | - | - | 11.44 | 18.02 | 10.46 | 18.02 | 21.70 | 11.44 | 14.69 |
| Nutrient management options | ||||||||||||
| Control | 1904.0 | 1913.8 | 0.0 | 0.0 | 1904.0 | 1913.8 | 501.4 | 448.8 | 1402.6 | 1465.0 | 1913.8 | 1458.5 |
| RDN | 1904.0 | 1713.8 | 0.0 | 0.0 | 1904.0 | 1713.8 | 784.1 | 730.8 | 1119.9 | 982.9 | 1713.8 | 1101.0 |
| RDN* + Zn** | 1904.0 | 5998.0 | 5000.0 | 5000.0 | 6904.0 | 10,998.0 | 860.9 | 810.1 | 6043.1 | 10,187.9 | 5998.0 | 6462.7 |
| 75% RDN | 1904.0 | 1792.7 | 0.0 | 0.0 | 1904.0 | 1792.7 | 673.2 | 629.4 | 1230.8 | 1163.3 | 1792.7 | 1211.9 |
| 75% RDN + Zn | 1904.0 | 6111.4 | 5000.0 | 5000.0 | 6904.0 | 11,111.4 | 706.8 | 655.9 | 6197.2 | 10,455.5 | 6111.4 | 6586.7 |
| 75% RDN + MC1 | 1904.0 | 1731.4 | 0.0 | 0.0 | 1904.0 | 1731.4 | 761.3 | 711.1 | 1142.7 | 1020.3 | 1731.4 | 1127.3 |
| 75% RDN + MC1 + Zn | 1904.0 | 6011.9 | 5000.0 | 5000.0 | 6904.0 | 11,011.9 | 841.7 | 793.0 | 6062.3 | 10,218.9 | 6011.9 | 6474.9 |
| 75% RDN + MC2 | 1904.0 | 1726.1 | 0.0 | 0.0 | 1904.0 | 1726.1 | 768.7 | 717.7 | 1135.3 | 1008.4 | 1726.1 | 1116.4 |
| 75% RDN + MC2 + Zn | 1904.0 | 6003.1 | 5000.0 | 5000.0 | 6904.0 | 11,003.1 | 854.0 | 797.2 | 6050.0 | 10,205.9 | 6003.1 | 6467.8 |
| SEm ± | - | 4.38 | - | - | - | 4.38 | 6.46 | 5.05 | 6.46 | 9.07 | 4.38 | 6.86 |
| CD (P = 0.05) | - | 12.46 | - | - | - | 12.46 | 18.37 | 14.36 | 18.37 | 25.79 | 12.46 | 19.52 |
| Interaction | - | Sig | - | - | - | Sig | Sig | Sig | Sig | Sig | Sig | Sig |
PTR, Puddled transplanted rice; SRI, System of rice intensification; ARS, Aerobic rice system; CDW, Conventional drill-sown wheat; SWI, System of wheat intensification; ZTW, Zero tillage wheat; RDN*, Recommended dose of nutrients [120 kg nitrogen ha–1 and 25.8 kg phosphorus (P) ha–1 per crop]; Zn**, 5 kg Zn ha–1 through ZnSO4.7H2O per crop; MC1, Anabaena sp. (CR1) + Providencia sp. (PR3) consortium; MC2, Anabaena–Pseudomonas biofilm; Potassium (K) was applied uniformly in all treatments @ 49.8 kg K ha–1 per crop; Sig, Significant.