Mean potential soil water stock in the growing season for the 10-year period 1971-1980

The map shows the mean potential soil water stock (in %FK) in the growing season (April – September) for the decade 1971-1980 calculated with the soil water balance model Bowab (for 0 – 60 cm). For plants, water availability in the soil is a central element for growth. This availability of soil water depends on the type of soil and the amount of water stored in the soil. The latter is largely influenced by precipitation and temperature (or evaporation). The soil water that can be used for plants is expressed as a percentage of the usable field capacity (%FK). A value of 100 % nFK or more means the storage capacity of the soil for plant-available water is achieved. From about 40 % nFK, irrigation of arable crops is recommended in order to achieve an optimal yield.本地图展示了1971-1980年代生长季（4月至9月）的平均潜在土壤蓄水量。该数据通过土壤水量平衡模型Bowab针对0至60厘米土层计算得出，单位为可用田间持水量百分比（%FK）。对于植物而言，土壤水分可利用性是其生长的核心影响因素。土壤水分可利用性取决于土壤类型与土壤储水量，而后者主要受降水与气温（或蒸发量）的影响。可被植物利用的土壤水分以%FK为单位量化。当数值达到100%nFK及以上时，代表土壤的植物可用水分存储容量已达上限。当土壤含水量约降至40%nFK时，建议对耕地作物进行灌溉以实现最优产量。