Fertilizer Recommendation: Correlation and Calibration Study of Soil P Test for Yard Long Bean (Vigna Unguilata L.) on Ultisols in Nanggung-Bogor

Yard long bean (Vigna unguilata L.) 777 was grown in Ultisols, which typically have low pH and high P-fixation, to determine the best correlation of soil extraction methods for soil P with yields, and to develop soil P response categories. The research was conducted at SANREM base camp in Hambaro Village, Nanggung, Bogor, Indonesia from April to August 2008. Treatments were arranged in a Split Plot Design with three replications. The main plots were treatments with soil P status of 0X, ¼X, ½X, ¾X and X, where is X = 1,590.5 kg SP-36 ha-1 (36% P2 O5 ) applied once a month before planting. The subplots were P application rate of 0, 75, 150, 225 and 300 kg P2 O5 ha-1. Yard long beans were planted in double rows per bed, 60 cm between rows and 25 cm within rows, 2 seeds per hole, with plot size of 1.5 m x 5 m. Coefficient correlation (r) of extraction reagents Olsen, Bray-1, HCl 25%, and Mechlich-1 were 0.772, 0.765, 0.755, and 0.732, respectively. Based on Olsen soil testing methods, soil response categories of very low, low, medium, and high were (ppm P2 O5 ) ≤ 18.40, 18.40 < P < 117.27, 117.27 < P < 267.04, and ≥ 267.04 extracted-P, respectively. Based on Bray-1 soil testing methods, soil response categories for low, medium, and high were ≤ 87.81, 87.81 < P < 233.78, and ≥ 233.78 extracted-P (ppm P2 O5 ), respectively. Fertilizer recommendation based on the Olsen soil test for low response category was 185.75 kg P2 O5 ha-1, and for the medium soil category was 175.97 kg P2 O5 ha-1. The Bray-1 soil test for the low response category was 184.31 kg P2 O5 ha-1 , and for the medium soil category was 161.39 kg P2 O5 ha-1

Pengaruh Volume dan Jenis Media Tanam pada Pertumbuhan dan Hasil Tanaman Selada (Lactuca Sativa) dalam Teknologi Hidroponik Sistem Terapung

The objective of this study was to find out the effect of volume and source of growth media and lettuce growth and yield in Deep Pool Growing System (DPGS). The study was conducted from September to December 2003 at Deep Pool Growing System facility, Danasworo Hydro - Garden Ciapus, Bogor. The Study was arranged in randomized completely block design with two factors. First factor was volume of growth media ( 20 cm³ and 110 cm³). The second factor was source of growth media (synthetic foam, cocodust, rice-husk + OSF and rice-husk + cocodust). Medium volume of 20 cm³ with rockwool was used as a check. Nutrient compotion of the solution was as follows (ppm): Ca 117, Mg 24, K 210, NH4 25, NO3 233, SO4 113, and PO4 60, Fe 2.14, B 1.2, Zn 0.26, Cu 0.048, Mn 0.18, and Mo 0.046. Medium volume of 20 cm³ with synthetic foam obtained the best yield for all parameters. Therefore, this treatment could replace rockwool as medium for lettuce production in DPGS

Sulfur Source, Rate, and Methods of Application for Polyethylene-mulched Tomato

Tomato (Lycopersicon esculentum L.) was grown with polyethylene mulch and drip irrigation on a Millhopper fine sandy soil testing very high in P and low in organic matter during two seasons to evaluate the effect of S source, rate, and application methods on plant growth and yield of fruit.  Sulfur rate of 34 and 68 kg S.ha-1 were applied with  preplant (broadcast in the bed), drip (10 weekly drip application), and  by split applications (50% preplant and 50% drip).  In split applications, S sources evaluated were ammonium sulfate and ammonium thiosulfate.  Plant height was increased with S application from 0 to 68 kg S.ha-1 in both studies. However, response on plant dry weight only occurred in spring 1999. Total marketable yield was 17.9 tons.ha-1 with 0 kg S.ha-1 and was increased linearly to 48.1 tons.ha-1 with application of 68 kg S.ha-1 in Spring 1999, but no response to S was obtained in the Spring 1998 study. Measured variables were not affected by S source and methods of application.  Increasing S application from 0  to 68 kg S.ha-1 reduced leaf and plant tissue P concentration 14 and 12% at mid season, 26 and 25% at  late season sampling times, respectively.  S application of 68 kg S.ha-1 reduced soil pH approximately 0.3 unit at the end of the season in both studies.   Key  words:  drip irrigation, sulfur,  fertigation, Lycopersicon esculentu

Response of Eggplant, Yard-Long Bean, and Kangkong on Polyethylene Mulched and Drip Irrigation System

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Sulfur Source, Rate, and Methods of Application for Polyethylene-mulched Tomato

Tomato (Lycopersicon esculentum L.) was grown with polyethylene mulch and drip irrigation on a Millhopper fine sandy soil testing very high in P and low in organic matter during two seasons to evaluate the effect of S source, rate, and application methods on plant growth and yield of fruit. Sulfur rate of 34 and 68 kg S.ha-1 were applied with preplant (broadcast in the bed), drip (10 weekly drip application), and by split applications (50% preplant and 50% drip). In split applications, S sources evaluated were ammonium sulfate and ammonium thiosulfate. Plant height was increased with S application from 0 to 68 kg S.ha-1 in both studies. However, response on plant dry weight only occurred in spring 1999. Total marketable yield was 17.9 tons.ha-1 with 0 kg S.ha-1 and was increased linearly to 48.1 tons.ha-1 with application of 68 kg S.ha-1 in Spring 1999, but no response to S was obtained in the Spring 1998 study. Measured variables were not affected by S source and methods of application. Increasing S application from 0 to 68 kg S.ha-1 reduced leaf and plant tissue P concentration 14 and 12% at mid season, 26 and 25% at late season sampling times, respectively. S application of 68 kg S.ha-1 reduced soil pH approximately 0.3 unit at the end of the season in both studies. Key words: drip irrigation, sulfur, fertigation, Lycopersicon esculentu

Pengaruh Kandungan P dan K Tanah terhadap Pertumbuhan dan Hasil Tanaman Tomat (Lycopersicon esculentum) pada Tanah Andisol

Tomat merupakan komoditas hortikultura yang banyak dibudidayakan dan dimanfaatkan di Indonesia. Produktivitas tomat dapat ditingkatkan dengan pendekatan teknologi budidaya seperti menggunakan teknologi irigasi dan pemupukan yang presisi. Penelitian bertujuan mengevaluasi pertumbuhan dan hasil tanaman tomat pada berbagai tingkat ketersediaan unsur hara P dan K di dalam tanah andisol asal Garut. Penelitian ini dilaksanakan di rumah plastik kebun percobaan tajur PKHT IPB menggunakan rancangan kelompok lengkap teracak (RKLT) dengan satu faktor berupa status hara (rendah, sedang, dan tinggi) pada unsur hara P dan K secara terpisah berdasarkan hasil uji cepat perangkat uji tanah kering (PUTK). Hasil penelitian menunjukkan bahwa status hara P tanah berpengaruh pada pertumbuhan tanaman, yaitu pada bobot kering tajuk, bobot kering akar, dan bobot kering total. Status hara K tanah nyata berpengaruh pada tinggi tanaman, bobot biomassa basah, bobot kering tajuk, bobot kering akar, bobot kering total, diameter batang, jumlah buah, dan total bobot buah. Status hara K tinggi menunjukkan hasil total bobot buah yang paling tinggi yaitu dengan rata-rata 320.17 gram tomat per tanaman atau setara dengan 10,565 ton ha-1, sedangkan status hara P tinggi menunjukkan hasil total bobot buah yaitu dengan rata-rata 256.32 gram tomat per tanaman atau setara dengan 8,458 ton ha-1.  Kata kunci: biomassa, fosfor, kalium, status hara, produktivita

Kemiripan dan Potensi Produksi Aksesi Pohpohan (Pilea Trinervia Wight.) dari Beberapa Daerah di Jawa Barat

Pohpohan (Pilea trinervia Wight.) is potential indigenous vegetable to be developed as a commercial vegetables. The objectives of this research were to observe similarity and production potential of pohpohan landraces from several areas in West Java. Result based on cluster analysis at nine similarity scale, thirteen exploration pohpohan landraces were grouped into three clusters. Clusters I consisted of Warung Loa, Tugu Selatan, Palasari, Langensari, Kayu Ambon, Lebak Muncang, Situsari, Sukalilah and Lebaksiuh. Clusters II consisted of Curug Rendeng, Argalingga and Linggarjati and clusters III was Bobojong. Result from further test using Duncan Multiple Range Test (DMRT), Warung Loa is a leading landrace because showed the best result on plant height, primary branches number, leaf width, yield per plot and plant productivity

Rekomendasi Pemupukan Fosfor pada Budidaya Caisin (Brassica rapa L. cv. caisin) di Tanah Andosol

ABSTRACTThis study was conducted to determine optimum phosphorus fertilizer application in Andosols soil, at the Pasir Sarongge, IPB Experimental Farm, Cianjur from April to May 2014. This research was arranged in split plot design with main plot five soil P status, namely X (1856.3 kg.ha-1 P2O5), 3/4 X (1392.225 kg.ha-1 P2O5), 1/2 X (928.15 kg.ha-1 P2O5), 1/4 X (464.076 kg.ha-1 P2O5) and 0 X (0 kg.ha-1 P2O5) and subplot five P fertilizer rates, namely (1856.3 kg.ha-1 P2O5), 3/4 X (1392.225 kg.ha-1 P2O5), 1/2 X (928.15 kg.ha-1 P2O5), 1/4 X (464.076 kg.ha-1 P2O5) and 0 X (0 kg.ha-1 P2O5), where X = 1856.346 kg.ha-1 P2O5 or 5156 kg.ha-1 SP-36, in which P was needed to achieve the highest levels of P in Pasir Sarongge Andosol. Rate of N and K were applied at 200 kg.ha-1 of Urea (45% N) and 100 kg.ha-1 KCl (60% K2O) respectively. The results showed that the soil nutrient Pwas able to enhance the growth and yield of caisin, whereas P fertilization treatment did not give significant effect on caisin growth and yield in the medium P content (Bray extractant) of Pasir Sarongge Andosols. The percentage of plants affected by mace root disease was 11.90%. It may influence the effectiveness of P fertilization. The P fertilizer rate recommendations in the Pasir Sarongge Andosol could not be determinedKeywords: fertilizer, P soils, vegetables, rateABSTRAKPenelitian ini dilakukan untuk menentukan dosis optimum pemupukan fosfor pada tanah Andosol. Penelitian dilakukan di Kebun Percobaan IPB Pasir Sarongge Cianjur mulai April hingga Mei 2014. Percobaan disusun rancangan Split Plot. Petak utama (main plot) adalah status hara P tanah yang diinkubasikan dari terdiri atas lima, 3/4 X (1392.225 kg.ha-1 P2O5), 1/2 X (928.15 kg.ha-1 P2O5), 1/4 X (464.076 kg.ha-1 P2O5) dan 0 X (0 kg.ha-1 P2O5), dimana X (1856.3 kg.ha-1 P2O5), Anak Petak (sub plot) adalah dosis pemupukan P yang terdiri atas lima taraf, yaitu X (1856.3 kg.ha-1 P2O5), 3/4 X (1392.225 kg.ha-1 P2O5), 1/2 X (928.15 kg.ha-1 P2O5), 1/4 X (464.076 kg.ha-1 P2O5) dan0 X (0 kg.ha-1 P2O5) dengan X = 1856.346 kg.ha-1 P2O5 atau 5156 kg.ha-1 SP-36, yaitu P yang dibutuhkan untuk mencapai kadar P sangat tinggi pada tanah Andosol Pasir Sarongge. Dosis N dan K yang digunakan adalah 200 kg kg.ha-1 Urea (45% N) dan 100 kg.ha-1 KCl (60% K2O). Status hara awal hara P tanah berpengaruh sangat nyata terhadap pertumbuhan dan hasil tanaman caisin. Namun demikian, perlakuan pemupukan P tidak memberikan pengaruh yang nyata terhadap pertumbuhan dan hasil tanaman caisin pada tingkat kesuburan P tanah sedang menurut pengekstrak Bray. Serangan penyakit akar gada kemungkinan dapat menjadi penyebab pemupukan tidak berpengaruh pada tanaman. Persentase jumlah tanaman yang terserang penyakit akar gada adalah 11.90%. Dosis rekomendasi pemupukan P untuk tanaman caisin di kebun Percobaan Pasir Sarongge belum dapat ditentukan.Kata kunci: pupuk, P tanah, sayuran, dosi

Pengaruh Volume dan Jenis Media Tanam pada Pertumbuhan dan Hasil Tanaman Selada (Lactuca sativa) dalam Teknologi Hidroponik Sistem Terapung

The objective of this study was to find out the effect of volume and source of growth media and lettuce growth and yield in Deep Pool Growing System (DPGS). The study was conducted from September to December 2003 at Deep Pool Growing System facility, Danasworo Hydro - Garden Ciapus, Bogor. The Study was arranged in randomized completely block design with two factors. First factor was volume of growth media ( 20 cm³ and 110 cm³). The second factor was source of growth media (synthetic foam, cocodust, rice-husk + OSF and rice-husk + cocodust). Medium volume of  20 cm³ with rockwool was used as a check. Nutrient compotion of the solution was as follows (ppm): Ca 117, Mg 24, K 210, NH4 25, NO3 233, SO4 113, and PO4 60, Fe 2.14, B 1.2, Zn 0.26, Cu 0.048, Mn 0.18, and Mo 0.046. Medium volume of 20 cm³ with synthetic foam obtained the best yield for all parameters. Therefore, this treatment could replace rockwool as medium for lettuce production in DPGS.   Key words : Deep Pool Growing System, hydroponics, growth mediu