Kalium Sulfat dan Kalium Klorida Sebagai Sumber Pupuk Kalium pada Tanaman Bawang Merah

Nikardi Gunadi

Abstract


Percobaan untuk mengetahui pengaruh 2 sumber pupuk kalium, yaitu kalium sulfat (K2SO4) dan kalium
klorida (KCl) serta dosis pupuk kalium terhadap pertumbuhan dan hasil bawang merah. Penelitian dilaksanakan di
lahan petani di Desa Ciledug (12 m dpl.), Cirebon, Jawa Barat dari bulan Juni sampai dengan Agustus 2003. Dua
sumber pupuk kalium, yaitu kalium sulfat dan kalium klorida ditempatkan sebagai petak utama dan dosis pupuk kalium,
yaitu 50, 100, 150, 200, dan 250 kg K2O/ha sebagai anak petak dalam rancangan petak terpisah dengan 3 ulangan.
Hasil penelitian menunjukkan bahwa pengaruh sumber pupuk kalium tidak nyata terhadap parameter pertumbuhan,
seperti tinggi tanaman, jumlah tunas, dan bobot kering komponen tanaman. Namun pada saat panen pupuk kalium
berpengaruh nyata. Tanaman yang mendapat pupuk K2SO4 mempunyai hasil umbi kering per tanaman, hasil umbi
segar per petak, dan hasil umbi kering per petak yang lebih tinggi dan berbeda nyata dibandingkan dengan tanaman
yang diberi pupuk KCl. Penggunaan pupuk kalium sulfat tidak nyata meningkatkan kualitas umbi bawang merah
pada saat panen dibandingkan dengan penggunaan pupuk kalium klorida. Pengaruh dosis pupuk kalium terhadap
beberapa parameter pertumbuhan tanaman bawang merah, seperti tinggi tanaman, jumlah tunas per tanaman, jumlah
daun per tanaman, dan juga bobot kering komponen tanaman serta pada saat panen, hasil umbi segar dan umbi kering
baik per tanaman maupun per petak (15 m2) tidak nyata.

ABSTRACT. Gunadi, N. 2009. Potassium Sulphate and Potassium Chloride as Sources of Potassium Fertilizer
on Shallots. An experiment to determine the effect of 2 sources of potassium fertilizer i.e. potassium sulphate (K2SO4)
and potassium chloride (KCl) and the rate of potassium fertilizer on the growth and yield of shallots was conducted
at farmer’s field in Ciledug Village (12 m asl.), Cirebon, West Jawa from June until August 2003. Two sources of
potassium fertilizers i.e. potassium sulphate and potassium chloride were assigned as main plots and the rates of
potassium fertilizers i.e. 50, 100, 150, 200, and 250 kg/ha were assigned as subplots. The experiment was arranged
in a split plot design with 3 replications. The results indicated that the effect of source of potassium fertilizer was not
significantly affect the growth parameters such as plant height, shoot number, leaf number, and dry weight of plant.
While at harvest, however, the effect was significant. The application of potassium sulphate gave higher dry yield
per plant, fresh yield per plot, and dry yield per plot (15 m2) compared to potassium chloride. The use of potassium
sulphate did not significantly increase the quality of shallot bulb at harvest compared to the use of potassium chloride.
The effect of potassium fertilizer rate was not pronounced on some growth parameters and yield of shallots such as
plant height, shoot number per plant, and leaf number per plant, total plant dry matter, fresh and dry yield either per
plant or per plot (15 m2).


Keywords


Allium ascalonicum; Potassium fertilizer; Potassium sulphate; Potassium chloride; Rate; Yield.

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DOI: http://dx.doi.org/10.21082/jhort.v19n2.2009.p%25p

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