Judul: Performance test of lapindo pitcher irrigation system on papper plant (Piper Ningrum L)
Abstrak: Nowadays, water crisis has been threathening agricultural activities in fulfilling sustainable food production expecially in dryland area. On the other side, there are a potentiality of using Lapindo mud for making irrigation pitcher which can be used for irrigate dryland agricultures effeciently. This study aims at testing the performance of the Lapindo pitcher irrigation system used to irrigate papper plant in a greenhouse. Two types of irrigation pitchers were used for the experiment. One has higher permeability 6.715 x 10-7 cm/s than the other 5.256 x 10-7 cm/s. After one month experiment, papper plants growed well but faster when using the higher permeable pitcher. From this study, Lapindo mud is very potential to be used as row material to make irrigation pitcher. It is hoped that this study will ease to handle Lapindo mudflow problem by utilizing it into a useful material.
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Judul: Analisis keseimbangan air pada irigasi bawah permukaan melalui lapisan semi kedap
Abstrak: Under surface irrigation system was specially designed for irrigating crop planted in pots. The pots were made of burned clay-earth material with semi pervious base layer by mixing clay and sand in certain composition. The semi pervious layer enable water goes pass through the base of the pots to fulfill the water requirement of the crop for growth. Research experiment using this system was conducted in a green house to find out the performance of the pots specially designed for the irrigation system using spinach (Amaranthus sp.) for the experimental crop. The evapotranspiration in the greenhouse was measured and calculated by means of Fieldserver Instrument in real time. Growth observation was conducted by recording the change in crop height through a period of time. During the 50 day planting time, the water available for the crop in the pot ranged from 26% to 35% volume basis with semi pervious layer of 30% sand mixture. Potential evapotranspiration ranged from 0,61 to 0,75 mm/d. The actual evapotranspiration ranged from 0,58 to 0,71mm/d with crop coefficient ranged from 0,1 to 1,7 with the use of the semi previous layer (30% sand mixture).
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Judul: Sifat Kemonotonan pada Darboux Sums
Abstrak: Darboux sums untuk fungsi di , - terbagi menjadi dua yaitu, upper Darboux sum dan lower Darboux sum. Untuk setiap partisi yang membagi interval , - menjadi subinterval dengan jarak yang sama, dibentuk suatu pendekatan dari nilai integral atau luas di bawah kurva yakni, upper Darboux sum ( ) yang mendekati dari atas kurva dan lower Darboux sum ( ) yang mendekati dari bawah kurva Tujuan penelitian ini adalah menunjukkan kemonotonan pada barisan { ( )} dan { ( )} tidak umum terjadi di , -. Setiap di , - dapat dihampiri oleh fungsi linear sesepenggal di , - sehingga barisan lower Darboux sum { ( )} dan upper Darboux sum { ( )} dari secara umum, berturut-turut tidak monoton turun dan naik. Tetapi, ekor barisan { ( )} dan { ( )} dari berturut-turut bersifat monoton turun dan naik. Kemudian, untuk kasus monoton naik di , -, sifat di atas juga berlaku untuk yang juga monoton naik. Demikian pula halnya bila monoton turun yang dihampiri oleh yang juga monoton turun.
Keyword: Darboux sums, kategori Baire, kemonotonan