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  1. No Access

    Article

    Soil and plant tests for available sulfur in wetland rice soils

    Soil tests, plant performance, and plant tissue analyses were used to study the availability of sulfur to wetland rice in 30 Philippine soils.

    M. M. Islam, F. N. Ponnamperuma in Plant and Soil (1982)

  2. No Access

    Article

    Dilute hydrochloric acid as an extractant for available zinc, copper and boron in rice soils

    Because zinc deficiency is a widespread disorder of wetland rice and copper deficiency may occur with it, 0.05M HCl was compared with 0.1M HCl, EDTA and DTPA as an extractant for available zinc and copper. It was...

    F. N. Ponnamperuma, M. T. Cayton, R. S. Lantin in Plant and Soil (1981)

  3. No Access

    Article

    Effects of water regime on growth, yield, and nitrogen uptake of rice

    The effects of water regime on the performance of rice were investigated in a greenhouse experiment and two field experiments. The greenhouse experiment involved four water regimes (continuous flooding, and so...

    C. S. Khind, F. N. Ponnamperuma in Plant and Soil (1981)

  4. No Access

    Chapter and Conference Paper

    Some Aspects of the Physical Chemistry of Paddy Soils

    Paddy soils are soils that are managed in a special way for the wet cultivation of rice. The management practices include flooding, puddling, maintaining a layer of standing water while the crop is on the land...

    F. N. Ponnamperuma in Proceedings of Symposium on Paddy Soils (1981)

  5. No Access

    Article

    Chemical retardation of the reduction of flooded soils and the growth of rice

    Wen Lin Yuan, F. N. Ponnamperuma in Plant and Soil (1966)

  6. No Access

    Article

    Toxicity of Boron to Rice

    IN the course of a study on the chemical retardation of soil reduction as a remedy for physiological disorders of the rice plant, we observed that despite this retardation by calcium nitrate and manganese diox...

    F. N. PONNAMPERUMA, WEN LIN YUAN in Nature (1966)

  7. No Access

    Article

    Manganese Dioxide as a Remedy for a Physiological Disease of Rice associated with Reduction of the Soil

    A PHYSIOLOGICAL disorder of rice known as ‘suffocation disease’ occurs on the poorly drained soils of northeastern Taiwan. The disease, which is characterized by a reddish-brown discoloration of the older leav...

    F. N. PONNAMPERUMA, WEN LIN YUAN, MAI THI MY NHUNG in Nature (1965)

  8. Article

    Physiological Disease of Rice attributable to Iron Toxicity

    IN the course of an investigation on the influence of the intensity of reduction of a submerged soil on the growth and yield of rice, it was observed that three of the twenty-seven treatments studied exhibited...

    F. N. PONNAMPERUMA, R. BRADFIELD, M. PEECH in Nature (1955)

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