Potato
検証済みデータSolanum tuberosum
ラビ · Punjab PK / UP India
施肥の推奨
N 170P₂O₅ 100K₂O 220kg/ha
Source: LfL Bayern / University of Idaho Extension (Ahmed research 2026-10-14)
How to Apply Fertilizer Correctly
Practical field advice for Potato — knowing how to apply fertilizer matters as much as knowing how much.
What is the correct way to flood DAP for Potato?
Dissolve the DAP with a DAP solvent in a drum so it fully dissolves. Do NOT open the drum valve at the start of irrigation — wait until the water has covered about 25% of the plot (roughly 1–1.5 kanal in). Then open the valve. Close the drum valve about 10 minutes before you stop the water, so the last flow of water carries the dissolved fertilizer evenly to the far end of the field.
Should urea be flooded with irrigation water, or broadcast afterwards?
Do NOT flood urea. Flooding loses 40–50% of nitrogen through leaching (deep percolation) and denitrification (lost as gas). Instead, broadcast (chhatta) the urea 1–3 days after irrigation, when the soil is moist (tar-wattar condition). This gives 30%+ better absorption than flooding.
How can I distribute fertilizer evenly across the field?
Open the fertilizer drum valve only after irrigation water has already entered 1–1.5 kanal — opening it too early empties the drum before the far end is reached. If the field is not laser-leveled, divide one acre into 2–4 plots (kyare): 2 plots for heavy clay soils, 3–4 for loam, and fertigate each plot separately. Keep checking both the field and the drum during irrigation until you get a feel for the timing.
When should phosphorus and potash be applied?
Phosphorus (P₂O₅) and potash (K₂O) are best applied at sowing as a basal dose, placed in the seedbed. If you missed it at sowing, dissolve the fertilizer (use a DAP solvent for DAP) and flood it at the first or second irrigation — flooding is far more effective than broadcasting for phosphorus and potash at that stage.
栽培条件
- 土壌
- Loose, well-drained sandy loam; avoid waterlogging.
- 水
- Light, frequent irrigations; stop 10 days before harvest.
- 栽培季節
- Plant October; harvest January – February.
- 適した地域
- Punjab PK / UP India
生育ステージと施肥
1
Basal · At planting
Full phosphorus + potassium + half nitrogen in ridges.
2
Earthing-up · ~30 days
Remaining nitrogen.
有機肥料のオプション
よく腐熟した堆肥、コンポスト、バーミコンポストは、Potatoの元肥としての土壌改良材に使えます。土壌構造を整え、生育期間を通じてゆっくり養分を放出します。有機物の養分含有量は原料によって変わるため、作物と地域に合わせて計算した化学肥料で正確な養分量を補いましょう。
この作物には作物固有の検証された有機線量は存在しません。上記のガイダンスは一般的な慣行であり、慎重に検討された推奨事項ではありません。材料をラボでテストして、正確な計画を立ててください。
参考文献
- Provincial agriculture departments / research institutes. LfL Bayern / University of Idaho Extension (Ahmed research 2026-10-14) — Punjab PK / UP India
最終確認日: 2026-10-01