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Korelasi Kadar Hara Fosfor Daun dengan Produksi Tanaman Manggis Liferdi, Lukman; Poerwanto, R; Susila, A D; Idris, K; Mangku, I W
Jurnal Hortikultura Vol 18, No 3 (2008): September 2008
Publisher : Indonesian Center for Horticultural Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRAK. Analisis daun dapat digunakan sebagai pedoman dalam mendiagnosis status hara dan rekomendasi pupuk pada tanaman manggis. Namun demikian, standar teknik pengambilan contoh daun harus ditentukan secara akurat. Umur daun adalah faktor utama dalam menentukan status hara tanaman buah-buahan. Daun yang tepat dijadikan contoh, yaitu ketika konsentrasi haranya mempunyai korelasi terbaik dengan pertumbuhan dan produksi. Konsentrasi hara mineral pada daun diamati pada 3 lokasi perkebunan manggis, yaitu Kabupaten Bogor, Tasikmalaya, dan Purwakarta mulai Mei 2003 sampai Mei 2004. Dua puluh pohon manggis dewasa yang relatif seragam dari masing-masing kebun diambil daunnya setiap bulan dan dianalisis kandungan P nya. Contoh daun diambil dari daun berumur 2 bulan setelah trubus dan seterusnya secara periodik hingga umur 10 bulan. Pengamatan produksi mencakup jumlah bunga yang mekar, jumlah bunga yang rontok, dan jumlah serta bobot buah per pohon. Sedangkan kualitas buah dilihat dari konsentrasi N,P, dan K dari masing-masing bagian buah dan padatan terlarut total. Hasil penelitian menunjukkan bahwa konsentrasi hara nitrogen, fosfor, dan kalium pada daun berkurang dengan bertambahnya umur. Pada daun asal Purwakarta, kadarnya lebih tinggi daripada Tasikmalaya dan Bogor serta berkorelasi positif dengan produksi. Korelasi konsentrasi P dari beberapa umur daun dengan produksi yang paling baik adalah daun umur 4 dan 5 bulan, dengan koefisien korelasi masing-masing di atas 0,7. Oleh karena itu, daun yang tepat sebagai alat diagnosis hara P untuk tanaman manggis adalah daun umur 4-5 bulan. Hasil penelitian ini dapat digunakan sebagai pedoman dalam menyusun rekomendasi pemupukan untuk tanaman manggis.ABSTRACT. Liferdi, R. Poerwanto, A.D. Susila, K. Idris, and I.W. Mangku. 2008. Correlation Test of Leaf Phosphor Nutrient with Mangosteen Production. Leaf analysis can be used as a guide to diagnose nutritional status and as a fertilizer recommendation tool for mangosteen tree. Therefore, sampling technique of standard leaf sampled should be established acurately. Leaves age are the main important factor to estimate plant nutritional status. The best of leaf sampling was the one which has the best correlation between leaf nutrients concentration with growth and yield. Leaf nutrient concentration was investigated on the mangosteen production orchard, at Bogor, Tasikmalaya, and Purwakarta Regency. Twenty relatively uniform and representative mangosteen trees had been selected, and every month leaf sample was analyzed for P concentration. Leaves sample were taken at 2 months after flush and then periodically up to 10 moths. Observations were done for number of open flower, number of dropped flower, and number as well as weight of fruit per plant. While for fruit quality analysis was done on the TSS of the flesh and the N, P, and K content of fruit parts. The results showed that 4 and 5 months leaf age were the best to be used as a leaf sample to diagnose P status since it has the highest correlation (above 0.7) between P concentration in the leaf and mangosteen fruit production. Phosphor concentration on the leaves decreased with the age of leaves increased. Mangosteen leaves from Purwakarta contained more P than those from Tasikmalaya and Bogor. This results can be used as a guide to estimate fertilizers recommendations for mangosteen.
Korelasi Kadar Hara Fosfor Daun dengan Produksi Tanaman Manggis Lukman Liferdi; R Poerwanto; A D Susila; K Idris; I W Mangku
Jurnal Hortikultura Vol 18, No 3 (2008): September 2008
Publisher : Indonesian Center for Horticulture Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jhort.v18n3.2008.p%p

Abstract

ABSTRAK. Analisis daun dapat digunakan sebagai pedoman dalam mendiagnosis status hara dan rekomendasi pupuk pada tanaman manggis. Namun demikian, standar teknik pengambilan contoh daun harus ditentukan secara akurat. Umur daun adalah faktor utama dalam menentukan status hara tanaman buah-buahan. Daun yang tepat dijadikan contoh, yaitu ketika konsentrasi haranya mempunyai korelasi terbaik dengan pertumbuhan dan produksi. Konsentrasi hara mineral pada daun diamati pada 3 lokasi perkebunan manggis, yaitu Kabupaten Bogor, Tasikmalaya, dan Purwakarta mulai Mei 2003 sampai Mei 2004. Dua puluh pohon manggis dewasa yang relatif seragam dari masing-masing kebun diambil daunnya setiap bulan dan dianalisis kandungan P nya. Contoh daun diambil dari daun berumur 2 bulan setelah trubus dan seterusnya secara periodik hingga umur 10 bulan. Pengamatan produksi mencakup jumlah bunga yang mekar, jumlah bunga yang rontok, dan jumlah serta bobot buah per pohon. Sedangkan kualitas buah dilihat dari konsentrasi N,P, dan K dari masing-masing bagian buah dan padatan terlarut total. Hasil penelitian menunjukkan bahwa konsentrasi hara nitrogen, fosfor, dan kalium pada daun berkurang dengan bertambahnya umur. Pada daun asal Purwakarta, kadarnya lebih tinggi daripada Tasikmalaya dan Bogor serta berkorelasi positif dengan produksi. Korelasi konsentrasi P dari beberapa umur daun dengan produksi yang paling baik adalah daun umur 4 dan 5 bulan, dengan koefisien korelasi masing-masing di atas 0,7. Oleh karena itu, daun yang tepat sebagai alat diagnosis hara P untuk tanaman manggis adalah daun umur 4-5 bulan. Hasil penelitian ini dapat digunakan sebagai pedoman dalam menyusun rekomendasi pemupukan untuk tanaman manggis.ABSTRACT. Liferdi, R. Poerwanto, A.D. Susila, K. Idris, and I.W. Mangku. 2008. Correlation Test of Leaf Phosphor Nutrient with Mangosteen Production. Leaf analysis can be used as a guide to diagnose nutritional status and as a fertilizer recommendation tool for mangosteen tree. Therefore, sampling technique of standard leaf sampled should be established acurately. Leaves age are the main important factor to estimate plant nutritional status. The best of leaf sampling was the one which has the best correlation between leaf nutrients concentration with growth and yield. Leaf nutrient concentration was investigated on the mangosteen production orchard, at Bogor, Tasikmalaya, and Purwakarta Regency. Twenty relatively uniform and representative mangosteen trees had been selected, and every month leaf sample was analyzed for P concentration. Leaves sample were taken at 2 months after flush and then periodically up to 10 moths. Observations were done for number of open flower, number of dropped flower, and number as well as weight of fruit per plant. While for fruit quality analysis was done on the TSS of the flesh and the N, P, and K content of fruit parts. The results showed that 4 and 5 months leaf age were the best to be used as a leaf sample to diagnose P status since it has the highest correlation (above 0.7) between P concentration in the leaf and mangosteen fruit production. Phosphor concentration on the leaves decreased with the age of leaves increased. Mangosteen leaves from Purwakarta contained more P than those from Tasikmalaya and Bogor. This results can be used as a guide to estimate fertilizers recommendations for mangosteen.
Solubility of Rock Phosphate and SP-36 in Peat Soils Amended with Mineral Soil WIWIK HARTATIK; K IDRIS
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 27 (2008): Juli 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n27.2008.%p

Abstract

Rock phosphates application on peat soil has a good prospect because of its high solubility in acid condition. However, the study of the solubility of rock phosphate in peat soils is still limited. This study aimed to quantify the solubility of rock phosphate and the effects of some sources of rock phosphates and SP-36 in the peat soils, taken from South Sumatera amended with mineral soil. The study was conducted in the laboratory ofIndonesian Soil Research Institute, in Bogor. The study consisted of two activities: 1) study on the solubility of some rock phosphates (Marocco, Christmas, and Ciamis) in peat soils. For this study a 100 g of oven dried (105oC) peat soil for each treatment was used for this study. The treatments were eleven levels of P i.e. 0, 10, 20, 30, 40, 50, 60, 75, 100, 125, and 150 ppm P applied to dried peat soils. The treated peat soils werethen incubated for 2 weeks before analyses of soluble P was conducted. The molybdat blue method was used to analyze the samples at 2, 4, 8, and 12 weeks after the incubation. 2) The second study i.e. the application of some rock phosphates or SP-36 on the peat soils amended with mineral soils, four levels of P (25, 50, 74, and 100% of P sorption) plus partial and complete control treatments have been replicated twice. Two hundred grams of oven dried peat soils (105oC) amended with mineral soils at 7,5% maximum Fe sorption, incubated for four weeks, and then soluble P was analyzed using molybdat blue at 1, 2, 4, 6, 8, 10, and 12 weeks after incubation. The results showed that the order of rock phosphates solubility in peat soils was Marocco> Ciamis>Christmas. The solubility of P in peat soils amended with mineral soil and rock phosphates gave similarresults as rock phosphate was in the order of SP-36>Marocco>Ciamis> Christmas. Soluble P increased up to 8 weeks of incubation, and then decreased. The effect of soil mineral ameliorant and some rock phosphates application of soluble P at 12 weeks after the incubation around 15.7-34.2 ppm P. Rock phosphates that has high reactivity gave a high Psolubility on peat soils so it that can be used as P sources in the peat soil.
Co-Authors A D Susila A D Susila I W Mangku Lukman Liferdi R Poerwanto Wiwik Hartatik