Dampak pemupukan N dan zeolite pada pertumbuhan serta hasil tanaman sorghum (Sorghum bicolour L.) Var. SUPER 1


Nur Edy Suminarti(1*)

(1) Universitas Brawijaya, Indonesia
(*) Corresponding Author

Abstract


Nitrogen merupakan unsur hara esensial tanaman yang diperlukan paling banyak dibandingkan unsur hara lainnya. Namun demikian, pemberian pupuk N secara terus menerus berdampak pada menurunnya daya dukung lahan. Zeolit yang dapat digunakan untuk mengefisiensikan penyerapan N. Penelitian bertujuan untuk mengkaji dampak pemberian zeolit pada berbagai taraf pemberian N pada tanaman sorgum dilakukan dari bulan April hingga Juli 2017 di lahan sawah Desa Sumberduren, Kabupaten Kediri, menggunakan Rancangan Petak Terpisah dengan menempatkan dosis pupuk N (50%, 100% dan 150%) pada petak utama, dan dosis zeolit (0%, 50%, 100% dan 150%) pada anak petak yang diulang 3 kali. Ada tidaknya interaksi atau pengaruh nyata menggunakan Uji F taraf 5% dan dilanjutkan Uji BNJ taraf 5% untuk mengetahui perbedaan diantara perlakuan. Hasil penelitian menunjukkan dosis N 50% pada zeolite 150% mendapatkan hasil biji sorghum sebesar 3,32 t ha-1. Adapun dosis N 100% dan 150 % mengurangi penggunaan zeolite sebesar 43,5% dan 48,12% dengan hasil biji sorghum sebanyak 4,56 t ha-1 dan 5,15 t ha-1. Aplikasi 50% dan 100% zeolit dapat menekan penggunaan N sebesar 13,67% dan 16,19%.

ABSTRACT

Nitrogen is an essential nutrient and needed in the highest amount compared to other elements. However, the continuous use of nitrogen  causes a decrease in the carrying capacity of the land. Therefore to anticipate these problems, zeolite applications is prior to be done. The study aimed to assess the effect of N and zeolite application on sorghum plants which had been carried out from April to July 2017 in paddy fields in Sumberduren Village, Kediri Regency. Split Plot Design was used in this study by placing N fertilizer doses (50%, 100% and 150%) as the main plot, and zeolite dosage (0%, 50%, 100% and 150%) on subplots repeated 3 times. F test at 5% was used to determine the effect of treatments, while the average difference between treatments were referred to HSD value at 5%. The using of 100% and 150% N dosages could reduce the zeolite usage about 43.5% and 48.12% with sorghum yield as much as 4.56 t ha‐1 and 5.15 t ha-1 respectively. However, with the application of 50% and 100% zeolite, it can reduce N use by 13.67% and 16.19%.


Keywords


Nitrogen, Produktivitas, Sorgum, Zeolit

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DOI: https://doi.org/10.15575/3923

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