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KMID : 0903519940370030182
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1994 Volume.37 No. 3 p.182 ~ p.188
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Development of K - bioassay for the Efficient Potassium Fertilization of Citrus Tree
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Abstract
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Similar to the ^(42)K uptake, ^(86)Rb uptake by the roots of Hordeum distichum grown in the hydroponic culture was negatively correlated with the concentration of K supplied previously, showing that ^(86)Rb can be used for the K-bioassay. ^(86)Rb having longer half life (18.86 day) than ^(42)K (12.36 hr) allowed the use of larger number of root samples. ^(86)Rb uptake of 3 years old Citrus unshiu Marc. grown in water culture decreased drastically with the increase of K concentration of the culture solution, thus demonstrating that the nutrition status of K for citrus trees can be diagnosed by K-bioassay using ^(86)Rb tracer. ^(86)Rb uptake by the excised roots of Hordeum distichum grown in the pot with different K fertilizations was well correlated with the exchangeable K in soil. The amount of exchangeable K in soil for the optimal plant growth can be determined by its relationship. ^(42)K and ^(86)Rb-uptake by the Hmdeum distichum roots were markedly inhibited by 5×10^(-3) M KCN in the bioassay solution, indicating that uptake is energy-dependent. There was no significant relationship between K content in citrus leaves and K concentration in the water-culture medium. It is concluded that K-bioassay is a potentially useful tool for determining of K requirement in citrus trees.
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