| Experiment variant |
Fertility level (А) |
Fertilizer system (В) |
Plant protection system (С) |
| 000 (c) |
Original soil fertility (А0) |
Without fertilizers (В0) |
No protection products (С0) |
| 111 |
Medium soil fertility (200 t/ha of manure + 200 kg/ha Р2О5; А1) |
Minimal (N20Р30 + N30 in early spring; В1) |
Biological plant protection system(biologicals; С1) |
| 222 |
Increased soil fertility (400 t/ha of manure+400 kg/ha Р2О5; А2) |
Medium dose (N40Р60 + N60 in early spring; В2) |
Chemical plant protection system against weeds(С2) |
| 333 |
High soil fertility (600 t/ha of manure + 600 kg/ha Р2О5; А3) |
High dose (N80Р120 + N120 in early spring; В3) |
Integrated plant protection system against weeds, pests and diseases (С3) |
