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Hardy Guchi
Program Studi Agroekoteknologi Fakultas Pertanian, USU, Medan
Agriculture, Biological Sciences & Forestry

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Pengukuran erosi pada pertanaman kentang dan jagung padabeberapa kemiringan di desa Guru SingaKabupaten Karo dengan metode USLE Ananda P Harahap; Hardy Guchi; Jamilah
Jurnal Pertanian Tropik Vol. 5 No. 1 (2018): JURNAL PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (319.219 KB) | DOI: 10.32734/jpt.v5i1.3133

Abstract

The type of plant and selection of conservation techniques greatly influence the extent of erosion. The aim of this study was to measure the value of the erosion in the field of potato and corn with the slopes by using USLE method (Universal Soil Loss Equation). This study had been implemented in the fields of potato and corn with a slope 0-3, 3-8%,8-15%, 15-25% and 25-45% in Guru Singa village, Berastagi sub-district, Karo district started on April until October 2016. Soil analysis was carried out in Research Laboratories and Technological Faculty of Agriculture, Universitas Sumatera Utara. The result showed that the amount of erosion occurred in the potato field. The field planted by contour direction in slope 0 – 3 % was 4,55 ton ha-1 yr-1 with the low level of erosion hazard. The highest level of erosion hazard in slope 8 – 15 % was 112,57ton ha-1 yr-1. The highest level of erosion hazard in slope 15 – 25 % was 160,97ton ha-1 yr-1. Based on data from the cornfield planted by cutting on contour, the amount of erosion in slope 3 – 8 % was 15,61ton ha-1 yr-1with the middle level of erosion hazard. The highest level of erosion hazard in slope 25 – 45% was 106,08ton ha-1 yr-1. It is required to do the changing of land conservation in order to minimize the risk of erosion or at least equal to the soil erosion tolerated.
Uji Infektifitas dan Efektifitas Rhizobia sp. terhadap Tanaman Kedelai di Rumah Kasa pada Tanah Ultisol dengan pH yang Berbeda M. Reza Alfikri; Hardy Guchi; Asmarlaili Sahar Hanafiah
Jurnal Pertanian Tropik Vol. 5 No. 1 (2018): JURNAL PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (539.708 KB) | DOI: 10.32734/jpt.v5i1.3139

Abstract

Rhizobia fixed nitrogen from the air and supplied legume and effected to soil fertility. The research was conducted in May 2017 until November at Soil Biology Laboratory and Screen House of Agriculture Faculty University of Sumatera Utara. This research was carried out with 2 stages: growth test at various pH with isolate tested (TJA 1, TJA 2, TJA 3, BGR 1, BGR 2, BGR 3, BGR 4, BALAI 1, BALAI 2, BALAI 3, LP 1, LP 2, LP 3, LP 4 and LAB) and the infectivity test and the effectivity of Rhizobia. The research used Randomized Block Design with 2 treatment: Lime (Without Lime and Lime 1 x Aldd) and Isolate Rhizobia (TJA 1, TJA 3, BGR 1, BGR 3, BGR 4, BALAI 2, BALAI 3, LP 1, LP 2, LP 4 and LAB). The application of Rhizobia’s isolate BGR 3 showed the infektively with root nodule amount criteria(124,00). The isolate Rhizobia’s BGR 3 effectively increased N plant level and N absorption (3,80 %; 31,08mg/plant). Application of isolate Rhizobia was not able to increase the level of P plants and P plant uptake. The best interaction was shown (Plant height 85.00 cm, stem diameter 3.93 mm, root nodule 127.50, N level of 3.80%, N absorption 30.16 mg / plant) by treatment of BGR 3 and Lime 1 x Aldd.
Co-Authors alfikri, m reza Ananda P Harahap Asmarlaili Sahar Hanafiah Jamilah