APPLICATION OF ORGANIC MANURE ON SWEETPOTATO (Ipomoea batatas (l.) Lam.)

Authors

  • Margo Yuwono
  • Nur Basuki
  • Lily Agustina

Abstract

Objectives of this experiment are to (1) compare the growth and yield of sweet potato with organic matters treatment and with an inorganic treatment, (2) find out which type and proportion of organic matters is better for sweet potato growth and yield, (3) determining  starch and anthocyanin contents in tuber, and (4) determining N-residue after organic matter treatment. The experiment were conducted in the Field Experiment Station, Jatikerto village, Malang .    The field experiment  was arranged in Randomized Block Design and replicates three times. The treatments were kind of organic matters e.i. (1) cow manure (P1); (2) Calopogonium muconoides (P2); (3) Centrosema pubescens (P3 ) and (4) Tithonia diversifolia (P4) and dosage e.i. (1) equivalent  40 kg N/ha (D1), (2) equivalent 80 kg N/ha (D2), (3) equivalent 120 kg N/ha (D3) and  (4) equivalent 160 kg N/ha (D4) and inorganic fertilizer  were applied 80 kg N/ha. The organic matter with 80 kg N/ha proportion resulted better growth and yield  compare to in-organic fertilizer with the same proportion.  Refer to the sweet potato growth and yield as resulted of organic fertilizer treatment, T. diversifolia gave the best result.  The order among these organic manure was T. diversifolia > cow manure > C. muconoides > C. pubescens. The highest yield of fresh tuber obtained at T. diversifolia treatment that is 26.02 t/ha. The lowest yield of fresh tuber obtained at C. pubescens tratment that is 22.12 t/ha.  Combination between T. diversifolia with dosage 160 kg N/ha (equivalent 5.04 t/ha)) will give highest of fresh tuber (29.39 t/ha) and combination betweeen C. pubescens and dosage 40 kg N/ha (equivalent 1.36 t/ha) will give lowest of fresh tuber. The highest of strach content obtained at T. diversifolia treatment (31.78%) and the lowest obtained at  C. pubescens treatment (25.07%). The highest of anthocyanin content obtained at C. pubescens (2.69 mg/kg) and the inorganic treatment resulting the lowest amount of anthocyanin (0.99 mg/kg). The result indicated the amount of N-reidue at the end of the experiment is 21.08 kg/ha.

Keyword : sweeet potato, organic manure, inorganic fertilizer

Issue

Vol. 1 No. 3 (2012)

Section

Articles

License

Authors who publish in this journal agree to the following terms: 

  1. Authors retain copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
  4. Once submitted, it is the corresponding author's responsibility to confirm and warrant the name included as an author of the work is true (shadow author is unacceptable) and that no conflict of interest occurred among the authors.