Accumulation of energy by non-irrigated and irrigated hop plants (Humulus lupulus)
2000
Hnilickova, H. | Novak, V. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
In the conditions of Ore Mts. shadow hop plants irrigation has a great importance for economic effectivity of hop growing. The shortage of water negatively influences the course of physiological processes, such as the growth and photosynthesis. Accumulation of energy matters is affected by this and finally also the yield formation. Accumulation of energy in hop plant is of a dynamic character in the course of vegetation. Maximum energy per unit of dry matter in hop plants is concentrated in the first half of vegetation and in the following period of vegetation the net energy was decreasing. Comparing both of the experimental variants shows that differences in net energy accumulation per 1 g of dry matter between non-irrigated and irrigated variant are not significant. Nevertheles the non-irrigated plants do not fully utilise rich in energy matter, what results in higher values of net energy per 1 g of dry matter. Maximum of energy in individual organs was acumulated during their intensive growth and during the following period of vegetation net energy in these organs was decreasing, except the hop cone by which the increase of energy content occurs during the pre-harvest period. Accumulation of net energy in hop cone could be explained by transporting of assimilates from leaves into underground organs. Comparing individual organs most of net energy per 1 g of dry matter was in leaves.
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