JURNAL ILMIAH AGRI PEAT FAPERTA UNPAR


Nisbah Nitrat ………. Pituaty, G dkk
2 April 2010, 3:39 am
Filed under: Penelitian

PENGARUH NISBAH NITRAT DAN AMONIUM TERHADAP KANDUNGAN N, PERTUMBUHAN DAN HASIL BEBERAPA VARIETAS JAGUNG MANIS

(Zea mays saccharata Sturt.) PADA TANAH GAMBUT PEDALAMAN

(The Effects of Nitrate and Ammonium Ratios on Nitrogen Content, Growth and Yield of  Several  Varieties of Sweet Corn (Zea mays saccharata Sturt.) on Ombrogenous Peat Soil)

Grisly Pituati, Sih Winarti, Hadinnupan Panupesi

Dosen Budidaya Pertanian Faperta UNPAR

ABSTRACT

A research has been done to determine of response several varieties of sweet corn (Super Sweet Corn, Sweet Boy and Ohara) were grown on ombrogenous peat soil and determine interaction between sweet corn varieties with nitrat and ammonium ratios (100/0 ; 75/25; 50/50; 25/75 and 0/100) on growth and yield. The experiment was design in randomized completely design of factorial and was done in four replications. Nitrogen fertilizer applied in combinations form gave significanst on tall of plant, leaf area index, net assimilations rate, relative growth rate and yield of sweet corn. Variety of sweet corn also gave significant on leaf area index, net assimilations rate, relative growth rate and yield. There were an interaction between nitrat and ammonium ratio and variety on yield of sweet corn. The nitrat and ammonium ratio at 75/25 had better effect on yield of sweet boy variety.

Key word : Nitrate Ammonium ratio, Peat Soil, Sweet Corn.

ABSTRAK

Sebuah penelitian  telah dilakukan untuk menelaah respon beberapa varietas jagung (Super Sweet Corn, Sweet Boy dan Ohara) yang ditanam pada tanah gambut pedalaman dan menelaah interaksi antara varietas jagung dengan nisbah nitrat dan amonium ((100 : 0, 75 : 25 , 50 : 50, 25 : 75 dan  0 : 100)  terhadap pertumbuhan dan hasil. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) faktorial dan disusun dalam empat ulangan. Aplikasi pemupukan  nitrogen dalam bentuk kombinasi memberikan pengaruh yang signifikan terhadap tinggi tanaman, indeks luas daun,  laju asimilasi bersih, laju pertumbuhan nisbi dan hasil dari varietas jagung manis. Macam varietas juga memberikan pengaruh yang berbeda terhadap indeks luas daun, laju asimilasi bersih laju pertumbuhan nisbi dan hasil.  Terjadi interaksi antara nisbah nitrat dan ammonium serta macam varietas terhadap pertumbuhan dan hasil tanaman jagung manis. Nisbah nitrat danamonium pada 75/25 memberikan hasil terbaik pada varietas Sweet Boy.

Kata Kunci : Nisbah nitrat amonium, tanah gambut, jagung manis


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