Table 5 Monitor system for NO3−-N, PO43−-P and K+-K of petiole in yield-graded
Growth period | Yield(kg/ha) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Full bud stage | Full bloom stage | Full boll stage | |||||||
NO3—N (mg/L) | PO43—P (mg/L) | K+-K (mg/L) | NO3—N (mg/L) | PO43—P (mg/L) | K+-K (mg/L) | NO3—N (mg/L) | PO43—P (mg/L) | K+-K (mg/L) |  |
9000–11000 | 100–265 | 8000–10000 | 6500–8500 | 270–400 | 6000–8500 | 5000–7500 | 185–300 | 4000–6500 | 6000–7100 |
7000–9500 | 85–180 | 7000–9000 | 5000–7000 | 200–300 | 5000–7000 | 3000–5500 | 100–200 | 2000–4000 | 4800–6000 |