Abstract
Red-yellow podzolic soils distributed in the province of Lampung, Indonesia are low in pH, phosphorus content as well as base supplying and rataining power. The most important nutritional factor limiting the growth of the main cereal crops on the red-yellow podzolic soils is the low phosphorus supply of the soils, followed by the low nitrogen supply. The low pH becomes an important limiting factor when the tolerance of crop species to low pH or high Al is weak. Thus, application of phosphorus and nitrogen is essential in order to increase crop production in the red-yellow podzolic soils and liming is required where crops sensitive to the low pH conditions of the soil are cultivated. Iron toxicity becomes a factor limiting the growth of lowland rice under ill-drained conditions. In addition, it is assumed that the low supply of potassium will also become a limiting factor in future.
