SIGNIFICANCE OF MASS FLOW IN NITRATENITROGEN SUPPLY TO PLANT ROOTS

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概要

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• Young corn plants (Zea mays L.) were grown in pots with Nishinosato loamy sand by moisturing with Ca(NO_3)_2 solution at different concentrations, in order to check the effect of the NO_3-N concentration of the soil solution on the plant growth without quantitative limitation of NO_3-N supply. Eight treatments were established according to the NO_3 concentration supplied. The dry weights of the plants increased with increase in the NO_3-N concentration for moisturing and reached a maximum at 12.9 me per liter NO_3-N in the supplied solution (treatment No.4). NACP(the amount of N absorbed by the plants divided by the amount of H_2O transpired in a given period, converted to me per liter) coincided with the NO_3-N concentration of the rhizosphere soil solution at around 20 me per liter, where transport of NO_3-N to the plant roots was limited in mass flow. The minimum NO_3-N concentration of the rhizosphere soil solution to give a maximum yield was found in No.4. The values were 11 5 and 9.3 me per liter in the first period (from 11 to 25 days after sowing) and second period (from 25 to 35 days after sowing), respectively. The contribution rates of diffusion were 8.8% in the former and 59.7% in the latter. NO_3-N transport to the plant roots is principally by mass flow so that a relatively higher NO_3-N concentration in the soil solution will be required for plant growth. In order to minimize the minimum NO_3-N concentration, favorable conditions for NO_3-N diffusion should be considered, since diffusion can compensate for the decrease of transport by the mass flow within certain limits.

• 社団法人日本土壌肥料学会の論文

著者

• Taniyama Ichiro

  Faculty Of Agriculture Hokkaido University

• OKAJIMA Hideo

  Faculty of Agriculture, Hokkaido University

• Okajima Hideo

  Faculty Of Agriculture Hokkaido University

関連論文

• SIGNIFICANCE OF MASS FLOW IN NITRATENITROGEN SUPPLY TO PLANT ROOTS
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