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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Forum Pasca Sarjana
Joedojono Wiroatmodjo
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Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance Education

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PENGARUH DOSIS NITROGEN DAN KALIUM TERHADAP PRODUKSI DAN MUTU TEMBAKAU TEMANGGUNG PADA TUMPANG SISIP KUBIS - TEMBAKAU DI PUJON MALANG Joedojono Wiroatmodjo; M. Najib
Indonesian Journal of Agronomy Vol. 23 No. 2 (1995): Buletin Agronomi
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1090.593 KB) | DOI: 10.24831/jai.v23i2.1629

Abstract

The experiment were carried out to determine the effect of N and K on growth, yield and quality of Temanggung tobacco grown intercropped with cabbage at Pujon, Malang. The factorial design with randomized block in five replications were used. Cabbage were planted from February-May, 1992 where as tobacco intercropped in April-September 1993. Three levels of nitrogen from Ammonium Sulphate namely 30 kg N/ha (N1), 60 (N2) and 90 kg N/ha (N3), while Potassium from Potassium Sulphate of 0, 50 and 100 kg K2O/ha were the treatment. Cabbage were fertilization at the rate of 390 kg N/ha and 780 kg P2O5/ha without K fertilization. The first tobacco fertilizations were done at a day after cabbage harvest when tobacco at 16 days old, the half dosages of N and full dosages of K were applied. Other half of N were applied when tobacco at 30 days old. The nitrogen did increase top leaf length, 10 leaf width, fresh yield and N content of Temanggung tobacco of variety of Genjah Kemloko. The potassium did increase quality index and crop index significantly. The N and K interactions is likewise influenced significantly the quality and crop indexes. The maximum leaf length and leaf width were obtained from 90 kg N/ha treatment, whereas highest quality and crop indexes obtained from 30 kg N/ha (N1) and 100 kg K2O/ha (K1) treatments. Highest N content of 3.707% were detected from 90 kg N/ha treatments.
W AKTU TANAM DAN POPULASI TANAMAN JAHE (Zingiber officinale Rosc.) SEBAGAI TANAMAN KEDUA DALAM POLA TANAM BERUNTUN Joedojono Wiroatmodjo
Indonesian Journal of Agronomy Vol. 23 No. 3 (1995): Buletin Agronomi
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (848.351 KB) | DOI: 10.24831/jai.v23i3.1633

Abstract

This study was designed to find out some cultural practices, i.e. the planting time and plant population, to minimize the yield losses of the second crop in ginger continuous cropping pattern. The pot experimental unit consist of planting time treatment (A) with 3 levels i.e. 1, 2, and 3 months after the harvesting of the first crop, and population treatment (B) with 3 levels i.e. 1, 3, and 5 plants/pot. The result shows that the growth and yield were not affected by the planting time treatment, but affected by the plant population treatment. By increasing the plant population from 1 plant/pot (equivalent to 33 300 plants/ha.) up to 3 plants/pot (equivalent to 99900 plants/ha.), the yield reduced about 27.56% in term of tuber fresh weight, but did not affect the tuber growth. Increasing the plant/ha. is not recommended since the production was appraised in term of tuber fresh weight.
Penggunan Ethepon untuk Peningkatan Hasil dan Ukuran Rimpang Jahe (Zingiber officinale Rosc.) Var. Badak Joedojono Wiroatmodjo
Jurnal Ilmu Pertanian Indonesia Vol. 1 No. 1 (1991): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Attempt to increase yield of 4-6 month old exportable ginger was tested by ethepon applications. This experiment was carried out at IPB Experimental Station Tajur from November 1988 - May 1989, with rates of application of 0, 10000, 20000, 30000, and 40000 ppm by volume. Sprayed plots were combinations of rice husk mulching (0 dan 5 ton/ha) and N fertilizations of 0,200 and 400 kg N/ha. Except for tuber weight and total production, the growth parameters were not influenched by ethepon. The best application of 10000 ppm markedly increased the fresh tuber weight by 91,8% per hill or 81,3% of the total yield.
Pengaruh Penggenangan Pada Berbagai Fase Pertumbuhan Kedelai (Glycine Max (L.) Merr) Terhadap Pertumbuhan dan Produksi Bangun Tampubolon; Joedojono Wiroatmodjo; Justika S Baharsjah; . Soedarsono
Forum Pasca Sarjana Vol. 12 No. 1 (1989): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

The soybean (Glycine rnax (L.) Merr) plant is able to make morphological adaptations to flooding such as the formation of adventive roots. Long-term continuous flooding result in reductive conditions in the rhizosphere which is detrimental to plant growth. This experiment was conducted to investigate the influence of flooding at various stages of soybean development on growth and yield of the crop on Alluvial and Red Yellow Podsolic soils. Flooding invariably resulted in the reduction of the net assimilation rate and yield of soybean. Reduction depended on the time and duration of flooding. Flooding during active vegetative growth (PI), flowering-pod filling (P2), seed ripening (P3), active vegetative growth and flowering-pod filling (P4), active vegetative growth and seed ripening (PS), flowering-pod filling and seed ripening (P6), and active vegetative growth until seed ripening (P7) respectively resulted yield reductions of 20.42, 50.74, 9.43, 46.68, 30.28, 52.63 and 35.26% compared to the unflooded control. The number and dry weight of root nodules and nitrogen fixation rate were highest in the P4 and P7 treatments. Nodules were formed on the adventive roots, when the soybean plants were flooded.
The Effect of Phosphorus Fertilization and Variety on The Growth and Production of Soybean (Glycine m a (L.) Merr) Under Saturated Soil Culture Munif Ghulamahdi; Fred Rumawas; Joedojono Wiroatmodjo; Jajah Koswara
Forum Pasca Sarjana Vol. 14 No. 1 (1991): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

The objective of this expaiment was to study the effect of phosphorus fertilization on the growth and production of Americana and Lokon under saturated soil culture. The experiment was conducted at the Cikarawang Experimental Station, IPB, on a Latosol, from November 1988 until April 1989. Soybean yield did not respond to the phosphorus application, and maybe due to improved soil P availability under saturated condition. Leaf P concentrations at 9 weeks were sufficient (0.303 to 0.357%) for all levels of treatment. Active nodule growth was longer under saturated soil culture than conventional irrigation. Maximum active nodule growth under conventional culture was reached at 6 weeks, but under saturated soil culture was still increasing between 6 to 9 weeks from 0.175 to 0.342 g/plant for Americana and from 0.162 to 0.260 g/plant for Lokon. Increase of active nodule dry weight was followed by increase of leaf N concentration between 6 to 9 weeks from 3.366 to 3.674% for Americana, and from 3.382 to 3.695% for Lokon. Americana was more tolerant than Lokon to saturated soil culture. Number of Tied pods, 100- sads weight, and seed dry weight/plot of Americana were bigger than Lokon.
Co-Authors . Soedarsono Bangun Tampubolon Fred Rumawas JAJAH KOSWARA Justika S Baharsjah M. Najib MUNIF GHULAMAHDI