The floating rice variety, Kanlang Phnom (KLP) and T 136, a non-floating variety, were subjected to deep water treatments, up to a depth of 25 or 45 cm at a plant age of about eight. The effects of the deep water treatments on plant growth were observed. The elongation of the tenth internode of KLP was markedly promoted by the treatments, while the elongation of the internodes of T 136 was not promoted at all. The elongation of the internodes of the third node tiller was also promoted in KLP, while that of the internodes of the third node tiller of T 136 and the fifth node tiller of both varieties was not promoted. The growth of tillers which had emerged from the subtending leaf sheaths was promoted, while that of the tillers^Note 1) which were still inside the subtending leaf sheaths was inhibited. The elongation of leaf blades and leaf sheaths of the main stem and tillers was also promoted by the deep water treatments without any difference between the two varieties.

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Four buffalo heifers which were divided into two groups of three and one animals, respectively, were tethered or raised on pasture without supplementary concentrates for 11 months in order to analyse their liveweight gain and carcass composition. Growth in wither height, body length and chest girth during the tethering period was 11.2±1.2, 15.3±1.5, and 25.0 ±2.0 cm, respectively, and 10.2, 13.0 and 35.0 cm during the grazing period. Daily gain was 0.340±0.028 kg in the case of tethering and 0.465 kg when the animals were allowed to graze. Average dressing percentage, length of carcass, width of thigh, depth of loin, girth of thigh and rib eye area were 54.8±2. 0 %, 196.8±2. 6 cm, 30.1±1.3 cm, 21.4±0.9 cm, 86.2±1.3 cm and 18.2 ± 3.7 cm², respectively. There was no variation in the number of thoracic, lumber, sacral and caudal vertebrae, which totalles 13, 6, 4 and 16, vertebrae, respectively. The evaluation of meat production in the water buffaloes used in this experiment is discussed.

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Significant developments of Lampung agriculture have been caused by the artificial improvements of regiomal ecosystems due to the recent large-scale hydrological construction. But the agriculture at the region is so stable and sometimes suffers drastic damage because these artificial improvements have not yet been accustomed to the nature and human life of the region.
So, after some consideration on regional agro-ecosystem and present condition of watershed, a simulation model for watershed management was developed and adapted to the Seputih river basin.
It is resulted that in order to maintain the stability of regional agriculture and hydro-facilities some improvement should be made as written in Section 5.
The rivers flowing through Lampung carry many suspended soil particles which eventually enter canals as sediment and close water passages. Rainfall is the first agent to produce soil erosion which makes river water turbid. Therefore, appropriate management of watershed is essential for the conservation or the improvement of regional agro-ecosystem.

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[in Japanese]

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The purpose of this study is to research the condition of rice growing in Lampung through the investigation of leaf area index, the permeability of light in the population, respiratory rate of roots and the classification of roots. An agro-ecological survey of rice growing of lowland field was made during dry season in the Province of Lampung, Indonesia, from Aug. 9th to Sept. 5th in 1981. The well-grown rice plants tend to branch roots up to the higher order branch. A high correlation is also found between the number of the second branched roots and the density of branched roots with the coefficient of r=0.89 and the equation of y=265, 4x+12.9. The amount of oxygen consumption varies among the varieties : Pelita shows large consumption, so Ketan of a local variety does, whereas Gajah Menur and Nyampah show small consumption as IR36 does. The population of IR36 has a sudden decrease of light at 30 cm stratum with only 7% light intensity on the surface of land. The population of Ketan has more light than that of IR36 with 14% light intensity on the surface of land in spite of the large LAI. Judging from the extinction coefficient of Ketan with 0.29 and that of IR36 with 0.43, the permeability of light is more efficient for Ketan.
It is amazing to detect little root-rot in the rice plants in Lampung comparing with that of Japan. The authers suppose this is because the rice plants in Indonesia are grown under the deficiency of fertilizer application.

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