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Edison Purba
Sumatera Utara University
Agriculture, Biological Sciences & Forestry

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Critical Period of Competition between Peanut (Arachis hypogaea L.) and Weed Muhammad Alghazali Adli; Edison Purba; Mbue Kata Bangun
Jurnal Agroekoteknologi Vol 6, No 4,Okt (2018)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.036 KB) | DOI: 10.32734/jaet.v6i4,Okt.18683

Abstract

The research was carried out at Tanjung Sari, Medan, where the weeds were predominated by Eleusine indica. The research was begun from November 2015 until February 2016. The weeding treatments consisted of  14 treatments (weed free from 0-2 weeks after planting (WAP); weed free from 0-4 WAP; weed free from 0-6 WAP; weed free from 0-8 WAP; weed free from 0-10 WAP; weed free from 0-12 WAP; without weeding from 0-2 WAP; without weeding from 0-4 WAP; without weeding from 0-6 WAP; without weeding from 0-8 WAP; without weeding from 0-10 WAP; without weeding from 0-12 WAP; weed free until harvest and without weeding until harvest). The treatments were arranged in randomized block design with three replicates. Parameter observed were plant height, number of branch, number of flowering, number of peas per plant, number of peas per plot, peas weight per plant, peas weight per plot, seed weight per plant, seed weight per plot, weight of 100 seed, kind of weed, dominant weed height and weed’s weight. The result showed that the weeding time for peanuts has no effect on the plant height and number of flowering, but sifnificantly affected the number of peas per plant, number of peas per plot, peas weight per plant, peas weight per plot, seed weight per plant, seed weight per plot and  weight of 100 seed. The critical periode of competition between peanut and weed occurred at 14 to 35 day after planting.
Morphological Characteristics of Pepper (Piper nigrum L.)Varieties ofNatar 1 and Natar 2 Tolerant of Shade Stress fajar setia ningrum; chairani hanum; edison purba
Jurnal Agroekoteknologi Vol 6, No 4,Okt (2018)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (396.937 KB) | DOI: 10.32734/jaet.v6i4,Okt.18686

Abstract

FAJAR SETIA NINGRUM: Morphological characteristics of pepper varieties of Natar 1 and Natar 2 tolerant of shade stress, guided by CHAIRANI HANUM and EDISON PURBA.Morphological observations were a preliminary identification for screening of tolerant shade plants, the ability to form chlorophyll and the initial step of the plant to be able to avoid shade stress.The research was conducted at Cengkeh Turi, North Binjai Subdistrict (32 meters above sea) from April to June 2017. Research used Split Plot Design with main plot was shade (0%, 25%, 50% and 75%) and sub plot was pepper shrub (Natar 1 and Natar 2).The results showed that the shade stress treatment had significant effect on the observed variables of plant height, the number of leaves and the calculation of chlorophyll a, the best shade level was N1 (25%) with the highest yield.Both varieties of shrimp pepper used have different responses on the number of branches, stem diameter, total leaf area, chlorophyll b, total chlorophyll, fresh crown weight, fresh root weight, canopy dry weight and root dry weight, tolerant varieties ie varieties natar 1. The number of leaves and the diameter of the stem is increased in the combination of the large-size treatment depending on the variety.   Keywords: characteristics, shade, varieties of pepper.
Co-Authors Chairani Hanum Chairani Hanum fajar setia ningrum Mbue Kata Bangun Muhammad Alghazali Adli