This research aimed to understand response of growth and rice productivity to the utilization of superior rice varieties and the application of biosilica fertilizer on rainfed land at different planting season. The study employed split plot design with three superior varieties of rice as main plot treatment and biosilica application as sub-plot. The growth and rice productivity were observed during dry season and rainy season. The utilization of superior rice varieties was only affected on number of total grains, 1000 grains weight and productivity at dry season meanwhile it affected the variables observed at rainy season. Application of biosilica fertilizer did not affect plant height, number of empty and total grains at dry season meanwhile it affected the variables observed at rainy season. Rice productivities were significantly different in both factors. Result showed that most of variables values obtained with biosilica application were higher. Biosilica fertilizer was able to increase productivity up to 1.08 tons/ha from 6.48 tons/ha to 7.56 tons/ha at dry season and up to 1.92 tons/ha from 8.7 tons/ha to 10.62 ton/ha at rainy season. This result indicated that utilization of superior rice varieties and biosilica fertilizer is recommended to increase rice productivity on rainfed land.

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Coffee is one of the leading commodities traded in the world and is a mainstay commodity for farmers in mountainous areas. The research objective is to increase the added value of the part of the coffee plant to increase income and food security for farmer families. The research was conducted in the Pupuan-Tabanan Bali robusta coffee agroforestry area, Januari 2017 to December 2020. Methods of data collection using the method of observation and discussion with the main actors who produce coffee in addition to seed study activities with the use of pruned water shoots from clone maintenance BP 308. Data analysis was carried out quantitatively and qualitatively. The results showed that the added value besides dry beans was obtained from water shoots, remaining productive pruning, unproductive old coffee, branches and twigs, and shade pruning. The yields of economic value are in the form of super cuttings, activated charcoal, exotic pots, and quality organic fertilizers from coffee skins, each of IDR 7,500,000; 120,000; 792,000; and 150,000.

Intercropping planting system is one of methods to enhance the land productivity. The maize and peanut crops waste has high beneficial to farmers for cattle feed. The study of maize and peanut crops intercropping has been conducted in May-August 2020. Study was arranged by using Randomized Complete Block Design with 5 treatments and replicated for 8 times. Treatments examined were P1: Srikandi Kuning maize variety cultivated by monoculture planting system; P2: Nasa 29 maize variety cultivated by monoculture; P3: Peanut crop cultivated by monoculture; P4: Srikandi Kuning and peanut crop cultivated by intercropping; P5: Nasa 29 and peanut crop cultivated by intercropping. Variables observed were growth and yield components and analysed by analysis of variance and advanced tested by LSD at 5%. To know the land productivity, the calculation of Land Equivalent Ratio (LER) was done meanwhile the Index of Plant Competition (IPC) also was calculated to know the plant competition level. Results showed that the peanut crop productivity by intercropping was decrease about 37.50%-38.79% compared to monoculture. Meanwhile, the productivity of Srikandi Kuning maize variety was also decrease due to the reducing of plant population. The intercropping of Srikandi Kuning and Nasa 29 variety with peanut crop enhance the LER became 1.02 and 1.03. The utilization of Nasa 29 maize variety by intercropping with peanut crop was better than Srikandi Kuning with the lower IPC namely 0.8932 meanwhile the IPC of Srikandi Kuning was 0.9270. The potential waste for cattle feed at maize crop plantation by monoculture was higher than intercropping with peanut crop and peanut crops by monoculture namely P3: 572 head/ha; P1: 500 head/ha; P5: 484 head/ha; P4: 454 head/day; P3: 288 head/day.

Research related to the optimization of cow performans is done through concentrate feed and reproduction technology. This research was conducted in 2018 in Musi Village, Gerokgak Sub-district, Buleleng Regency, Bali. The study used a Completely Randomized Design (CRD) with 4 feed treatments and used 7 pregnant cows as replicates. The treatment is carried out when the cows enters 7 months pregnancy. Treatments tested: P0 cows given forage + rice bran 1 kg /cow/day + Bio Cas 5 ml/cow/day (mating with males), P1 = P0 cows mated with Artificial Imsemination (IB), P2 cows given forage + concentrates 1 kg/cow/day + bio cas 5 ml/cow/day (mating with a male), and P3 = P2 cattle mated with IB. Parameters observed that the parent body weight, weight gain calf, calf birth weight, weaning weight, calving interval, dry matter intake and feed rations convertions ratio. Data were analyzed by analysis of variance, if there are significant differences (P <0.05), followed by LSD 5%. The results showed that cows given feed concentrates and mated with IB (P3) result in weight gain of 0.52 kg/calf/ day was significantly higher (P <0.05) of P0 (0.40 kg/calf/day). Consumption of dry matter ration for P3 (2.59 kg) was significantly less (P <0.05) than P0 (2.87 kg) and resulted in the highest weight gain causing P3 FCR value of 4.98 was significantly lower than P0. Calf birth weight of all treatments showed no significant difference (P>0.05), but calf weight gain for P3 0.57 kg/calf/day was highest (P <0.05) compared to treatments P0 and P1 so that weaning weight calves P3 to 121.43 kg was significantly higher (P <0.05) than treatments P0 and P1. Estrus post partus for P3 is 2.87 months and calving interval is 12.36 months shorter than other treatments. This shows that the cows whose given concentrate feed mated through artificial insemination / males cattle produces the highest birth weight and calf weaning and short calving intervals.