堆肥連用7年目の試験区。リン酸とカリウム量は同一で、窒素量を4水準に（0、4、8、16㎏／10a）に調節。気象、植物、土壌の計測から、水分収支と窒素収支を数値計算。より精密な計算のために冬場のリノベーション。
Visualization of Manure Effects
Experimental plots in the seventh year of continuous compost application. Phosphorus and potassium application rates were kept constant, while nitrogen rates were adjusted to four levels (0, 40, 80, and 160 kg/ha). Water and nitrogen budgets were numerically calculated based on measurements of meteorological conditions, plant parameters, and soil properties. Renovation during winter for more precise calculations.