PENGARUH PENAMBAHAN TITONIA TERHADAP SIFAT KIMIA ULTISOL DAN HASIL TANAMAN KEDELAI PADA MUSIM TANAM KE TIGA
DOI:
https://doi.org/10.25077/js.3.2.48-58.2006Abstrak
Last researches reported that Tithonia diversifolia (Mexican sunflower) could replace 25% to 50% of N and K of commercial fertilizer applied in  ginger and maize production on the first and second season planting time respectively in the Ultisols of West Sumatra.  A subsequent experiments were conducted to find out the the appropriate NK combination sources should be added on the third season to get high yield of soybean. The treatments were 8 combinations of NK-T. diversifolia + N + K commercial fertilizer for growing soybean such as A(0); B(0); C (25 kg NK+25 kg N+100 kg K); D (25 kg NK+ 25 kg N+100 kg K); E (50 kg NK+37,5 kg N+150 kg K); F(50 kg NK+37,5 kg N+150 kg K);  G(100kg N K+25 kg N+100 kg K); and H(100 kg NK+ 25 kg N+100 kg K).  The results showed that integrated use 25 kg NK from tithonia and 25kg N + 100kg K from commercial fertilizer (treatment C ) was an appropriate NK combination to get high yield of soybean (0,986 ton ha-1) on the third season in Ultisols, if on the first season ginger have been fertilized as 25% + 75% and on the second season maize have been fertilized as much 50% + 50% of NK from tithonia and NK from commercial fertilizer.
Key Words : Â Thitonia, Ultisol, green manure
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