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Joko Purbopuspito
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Agriculture, Biological Sciences & Forestry

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PRODUKSI, SEKUESTRASI DAN SEBARAN KARBON KANGKUNG AIR (Ipomoea aquatica, Forsk. L.) PADA KEBUN TELAGA DI DESA KALASEY SATU Syamsiar A. R.; Joko Purbopuspito; Jenny J. Rondonuwu
COCOS Vol. 8 No. 3 (2017)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v1i2.14917

Abstract

ABSTRACT  Biomass production of water spinach is a photosynthetic carbon assimilation by Ipomoea aquatica, Forsk. L. in reducing carbon in the air.  Water spinach grown at cultivated ponds of Kalasey Satu village followed natural irrigation system. We determined this water spinach biomass production and its carbon sequestration.  Soils and leafy vegetable products were sampled from upstream (Block A) to downstream (Block C) in 4 replicates per block for 3 consecutive observations.  Soil bulk densities in Block A (0.33 g.cm-3) is significantly heavier that that in Block C (0.22 g.cm-3) and soil depth in Block C (96 cm) was significantly deeper than solum depth in Block B (61 cm). Carbon production in water spinach, however, were not significantly different among blocks during 3 observation times.  Carbon sequestration of 20 days interval is 1.21 kg C.ha-1 which is equivalent to 22.1 kg C.ha-1.y-1.  Farmers' income from carbon sequestration is about Rp 551.958,- ha-1.y-1 and equivalent to USD 42.46 ha-1.y-1.  Keywords:  Water spinach (Ipomoea aquatica, Forsk. L.), vegetable production, carbon sequestration and carbon stock distribution
UJI TIGA JENIS PUPUK KANDANG TERHADAP PERTUMBUHAN DAN PRODUKSI BAWANG MERAH (Allium cepa, L.) Ester N. Pajow; Joko Purbopuspito; Meldi T.M. Sinolungan
COCOS Vol. 10 No. 7 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v1i5.25579

Abstract

Abstract Shallots are an important vegetable commodity in North Sulawesi with a high market demand.  This research tested the type of manures for the growth and production of shallot plants using a field experiment at the BPTP SULUT Experimental Field and soil testing at the Soil Fertility Laboratory, Faculty of Agriculture, UNSRAT.  The field experiment used four types of manure treatments in six replications, so that 24 experimental beds were obtained.  From this study, the best type of manure for plant growth, increasing the number of leaves and the number of tillers, and for the production of fresh shallots is obtained by dose of a 40 tons of chicken manure /ha or a 40 tons of cow manure /ha in contrast to a 40 tons of pig manure /ha or a control without manure, which is gained from soil fertility conditions with 1.62-1.70% C-organic; soil pH 6.60-6.64; 0,137-0,148% soil N-total land; 18.28-21.05 ppm soil P-available; and 20.44-23.54 ppm soil Kavailable.  Keywords :  chicken manure, cow manure, shallots.
RESPONS TANAMAN BAYAM MERAH (Amaranthus sp.) TERHADAP PEMBERIAN PUPUK SERTA SIFAT FISIK DAN KIMIA TANAHNYA Orinus Kogoya; Joko Purbopuspito; Jenny J. Rondonuwu
COCOS Vol. 10 No. 8 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v2i6.25786

Abstract

ABSTRACT This study aims to determine the effect of compost, NPK and Urea fertilizer on the growth of Red Spinach (Amaranthus, sp.) Plants and the physical and chemical properties of the soil. which fertilizer is best for red spinach plants and for soil analysis is carried out at the Soil Physics Laboratory and Soil Chemistry and Soil Fertility, Faculty of Agriculture, Sam Ratulangi University, Manado. This research was conducted using the Completely Randomized Design Method (CRD), where R0 was the control, R1 chicken manure compost, R2 NPK, Urea R3, this research was carried out in 4 treatments and 3 to obtain 12 experimental plots / beds. The results of this study indicate that the land in the Manado City Pakowa Village has a sandy loam and clay texture which has a relatively fast permeability rate, and has a slightly acidic soil acidity to the availability of nutrients N, P, K and C-organic is relatively low. Kata Kunci : Bayam Merah, Pengaruh Pupuk, Fisik dan Kimia
Co-Authors Ester N. Pajow Jenny J. Rondonuwu Meldi T.M. Sinolungan Orinus Kogoya Syamsiar A. R.