In order to realeze a high-efficient growth control for higher yielding, it is important to clarify the relationships between the physiolofical dynamics and the growth of a particular crop. Therefore, an assimilation chamber for simultaneous measurement of photosynthesis, shoot and root respiration,transpiration and ion uptake of a whole plant was developed. The relationship between plant growth and constructive respiration coefficient which was calculated by using McCree's equation, was investigated. The coefficient increased with the ratio of the assimilation of nitrogen and carbohydrate(⊿N/⊿C) during measurement. The higher ratio of ⊿N/⊿C is closely related to an increase in dry-matter partitioning of the leaf blade.In this measurement,light intensity was daily lowered to estimate the constructive respiration coefficient and plant gowth might be influenced under these conditions. Then measurements at condtant daylight intensity were done under different humidity and nutrient conditions, using several varieties. Consequently,shoot respiration rate was estimated by relative shoot growth rate and leaf blade/sheath ratio of dry matter increase.Respiratory enegy costs for organogenesis differed among the plant parts, and that of the leaf blade was higher than that of the leaf sheath. Root respiration rate was explained by the combination of relative root growth rate and nitrogen uptake rate. The respiratory energy cost for nitrogn uptake did not change with the transpiration rate, the nitrogen concentration in the culture solution nor with other varieties. Dry matter partitioning rate to shoot was found to have two main componets,i.e.initial nitrogen content of shoot and ratio of assimilated nitrogen and carbon in the first day. Dry-matter increase and dry matter partitioning of intact plants could be discovered by measuring CO2 exchange, nitrogen uptake and shoot nitrogen content.光強度を日毎に低下させながら個体のCO2収支を測定することによって、光合成産物と窒素増加量の比を知り得ることが明らかになり、その比は乾物分配に密接に関与するものと考えられた。そして、光強度を一定にした場合、異なる湿度および培養液濃度条件下において、あるいは、非構造性炭水化物含有率の異なるイネ個体を対象にした場合でも、個体のCO2収支、養分吸収および窒素含有率を測定することによって、乾物増加量の推定のみならず、茎葉部への乾物分配率の推定が可能なことが明らかになった。このことから、さらに他の環境条件、例えば、光強度、CO2濃度、温度などが異なる条件においても同様の結果が得られるか検討を行なうとともに、実際に、CO2収支、養分吸収および窒素含有率を測定し、乾物分配率を予測する重回帰式に当てはめることで、乾物分配率が推定できることを実証するための実験を行なう必要があるものと考えられた。また、同時に、個体の表面電位の測定による生理状態の検出方法についての研究を進めることで、植物の新たな生育診断法の確立に役立つものと考えられた。