A barrier to productivity on dryland is limited availability of water during dry season. Heavy rainfall at most in the dryland farming in Indonesia causes high runoff that occurred during precipitations. The huge potential of runoff can certainly be utilized as alternative water sources in the dry season to improve cropping index. The research purposes were to assess the potential of runoff farming system in improving the cropping index on dryland with wet climate. The study was conducted through observation field conditions, rainfall analysis, potential runoff analysis, crop water requirements analysis and water balance analysis in the dryland area. The result of the study indicated that peak of rainfall-runoff started in last decade of December until March. However, entering the second growing season, rainfall occurs until April only. It's implied that during the second growing season has led to a lack of water supply in the peak phase of crop water needs. Rainfall-runoff analysis indicates that surface runoff potential as an alternative source of irrigation in the dryland farming if managed well, one of which uses runoff farming system. With harvest runoff and store it for irrigation in dry season could increase the cropping index. The significant finding of this research was base on supply and demand water analysis shows that to increase cropping index of food crop in dryland with wet climate needed of catchment and cultivation area ratio (CCA ratio) equal to 6.2, to the form of catchment area was arable land with multi-cropping pattern and varies slope.
Water harvesting is a system which starts from harvesting rainfall in the wet season and collecting it in the big torrents, as irrigation resources and applied to the crops in the dry season for increased crop production. Horticulture crops such as red oval cherry tomato is predominantly an Indonesian crops for domestic and to support agro-industry sectors, which requires effective and efficient water management practice during the growth periods. Modification of irrigation system needs to optimize water and improve the red oval cherry tomato production. The study aims to find out water used by red oval cherry tomato with related irrigation resources from a supply of water harvesting as an appropriate technology in the dry season. The research was carried out at the greenhouse located in Universitas Padjadjaran; West Java, Indonesia from January to Mei 2017. The research method is descriptive analysis with cultivated of red oval cherry tomato and planted it on the autopot with growth media uses mixed of husk charcoal and zeolite with ratio 9:1 with 15 cm height. This study discovers that the rainwater harvesting as a source of irrigation on self-watering fertigation system using autopot can be beneficial for red oval cherry tomato yield.
Lahan sawah tadah hujan hanya mengandalkan hujan untuk pemenuhan kebutuhan air. Penentuan pola dan jadwal tanam sangat diperlukan agar kegagalan panen dapat dihindari sehingga keuntungan maksimum dapat diperoleh. Penelitian ini bertujuan untuk mengetahui pola dan jadwal tanam lahan sawah tadah hujan yang sesuai dengan kesetimbangan air dan menghasilkan keuntungan maksimum bagi petani di Kecamatan Cimanggung Kabupaten Sumedang. Metode penelitian yang digunakan dalam penelitian ini adalah metode deskriptif, yaitu mengkaji data curah untuk mengetahui ketersediaan air, menentukan pola dan jadwal tanam yang sesuai dengan ketersediaan air, dan menentukan pola tanam yang dapat menghasilkan keuntungan maksimum dengan menggunakan program linier. Hasil penelitian menunjukkan bahwa jadwal tanam yang terbaik untuk Kecamatan Cimanggung adalah November dasarian II (MT I) dan Februari dasarian III (MT II) dengan pola tanam: Padi-Padi; Padi-Jagung; Padi-Tembakau; Padi-Timun; Padi-Jagung Manis; dan Jagung-Jagung. Berdasarkan analisis optimasi, pola tanam yang memberikan keuntungan maksimum adalah Padi-Timun.
Global climate changes which cause increasing the dry season and impact of decreasing in water resources. Water has an important role in agriculture sector especialy to the process of plant growth and water use efficiency while rainfall harvesting will impact of water quality .Fertigation and using autopot is an alternative of water used efficiency and plant nutrition. Fertigation also will affect the ability of melon (Cucumis melo L) to produce quality of melon especially water use efficiency, carbohydrate, protein, mineral, vitamin C and sweetness.. The methode of the research is descriptive analysis. The results showed that rainfall harvesting quality contained pH 5,6; electronic conductivity (EC) 0,22 mS/cm; TDS 3,075 mg/l; TSS 7,0 mg/l; and turbidity 5,29 NTU ;all thing appropriate to the melon needs except EC. Fertigation was significant effect to the yield of melon and avarage value of water used efficiency was 93,89% and total sweteness 10% brix; carbohydrate 2,65%; proten 1,94%; fat 0,3%; ash 0,89% and vitamine C 26,18%. In conclusion impact of water rainfall harvesting suitable and could applied for fertigation resources and using auto pot.
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