Karakter Morfofisiologis Tiga Varietas Kedelai (Yaya Hasanah)

KARAKTER MORFOFISIOLOGIS TIGA VARIETAS KEDELAI 
PADA KONDISI CEKAMAN KEKERINGAN
DENGAN APLIKASI HARA NITROGEN

MORPHOPHYSIOLOGICAL CARACTERS OF THREE SOYBEAN VARIETIES ON DROUGHT STRESS CONDITION
WITH APPLICATION OF NITROGEN NUTRIENT


Yaya Hasanah1), Tengku Chairun Nisa2), Hapsoh3) dan Hamidah Hanum4)
1,2,4)Program Studi Agroekoteknologi, Fakultas Pertanian Universitas Sumatera Utara
Jalan A. Sofyan Kampus USU Medan 
3)Program Studi Agroekoteknologi, Fakultas Pertanian Universitas Riau
Email: azkia_khairunnisa@yahoo.co.id

Diterima Mei 2013, diterima setelah perbaikan Juli 2013
Disetujui untuk diterbitkan Februari 2014

Abstrak: Peningkatan produksi kedelai menghadapi tantangan berupa alih fungsi lahan serta keterbatasan air karena perilaku iklim akibat global warming. Keadaan ini berakibat lahan pertanian beralih ke lahan kering tetapi mengalami kendala berupa kandungan hara makro rendah dan cekaman kekeringan. Penelitian ini bertujuan untuk mengetahui karakter morfofisiologis tiga varietas kedelai dalam kondisi cekaman kekeringan dengan aplikasi hara Nitrogen. Penelitian dilakukan di rumah kassa Fakultas Pertanian Universitas Sumatera Utara pada bulan Februari-Mei 2012. Penelitian menggunakan Rancangan Acak Kelompok dengan 3 faktor dan 3 ulangan. Faktor pertama yaitu varietas kedelai (Anjasmoro, Wilis dan Sinabung). Faktor kedua yaitu kondisi air tanah (50%, 60%, 70% dan 80% kapasitas lapang/KL). Faktor ketiga yaitu aplikasi hara N (tanpa aplikasi hara N; pupuk N an organik (50 kg Urea/ha) ; N hayati (Bradyrhizobium sp; N organik (kompos jerami 10 t/ha) ; N organik (Pupuk kandang 10 t/ha). Hasil penelitian menunjukkan terdapat perbedaan respons karakter tinggi tanaman 2-6 MST, total luas daun dan kehijauan daun pada varietas Anjasmoro, Sinabung dan Wilis terhadap % KL yang rendah. Tanaman yang diinokulasi Bradyrhizobium sp. menghasilkan tinggi tanaman dan total luas daun lebih tinggi. Ketersediaan air hingga 50% KL belum memberikan respons nyata dibandingkan ketersediaan air 80% KL terhadap kehijauan daun. Perlakuan tanpa pemberian N cenderung menurunkan kehijauan daun sedangkan Urea memberikan kehijauan daun tertinggi.

Kata kunci: cekaman kekeringan, kedelai, morfofisiologis, dan nitrogen.


Abstrack: Increasing of soybean production had the challenge such as land use conversion and the limited of water because of the climate behaviour due to global warming. The condition caused the movement of agricultural land to dry land. The dry land had the problems such as the lack of essensial nutrient and drought stress. The research aimed to know the morphophysiological characters of three soybean varieties on drought stress condition with application of Nitrogen nutrient. The research conducted at screen house of Faculty of Agriculture, University of Sumatera Utara on February to June 2012. The research used Randomized Block Design with three factors and three replications. The first factor is soybean varieties (Anjasmoro, Wilis, Sinabung). The second factor is application of Nitrogen nutrient (without N application, an organic fertilizer (Urea 50 kg t/ha), biofertilizer (Bradyrhizobium sp.) ; organic fertilizer (cow manure) ; organic fertilizer (straw compost). The research result that the difference response of plant height 2-6 Week After Planting (WAP), total of leaf area and the leaf greenness of Anjasmoro, Sinabung and Wilis on the low of field capacity. Inoculation of Bradyrhizobium sp. result the higher of plant height and total of leaf area. The water field capacity until 50% of water field capacity had not given the significance response than 80 % of water field capacity on leaf greenness. The treatment of without Nitrogen tent to decrease the leaf greenness, however the application of Urea gave the highest of the leaf greenness. 

Keywords: drought stress, soybean, morphophysiological, and nitrogen.

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Lingkungan Tropis,
Sep 28, 2015, 6:55 AM
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