Pertumbuhan Jagung Manis (Zea Mays Saccharata) Dan Kadar Fosfor Jerami Dengan Pemupukan Organik Dan Urea (the Growth of Sweet Corn (Zea Mays Saccharata) and Phosporus Concentration of Stover with Urea and Organic Fertilization)

The study was conducted to examine the effect of organic and urea fertilizer on the growth and phosphorus concentration of sweet corn stover. The field experiment was conducted in August – December 2013 in Faculty of Animal and Agricultural Sciences laboratory Diponegoro University. Material used in this study was sweet corn seed, compost, manure, charcoal and urea (46% N) also KCl and TSP as basic fertilizer. The experimental design used was Monofaktor Completely Randomized Design (CRD) 9 treatments with 3 replicates, so there are 27 plots with the size of each is 1.6 x 1.2 m (1.92 m2). The parameters observed were plant height, dry matter yield, and phosphorus concentration of sweet corn stover. Research data processed by analysis of variance, if the treatment has significant effect, then followed by contrast test. The result showed that fertilizer application deliver significant effect on height plant, dry matter yield, and phosporus concentration compared to without fertilizer. Organic fertilizer plus urea deliver higher significant effect on height plant and dry matter yield compared to organic fertilizer. Compost plus charcoal deliver higher significant effect on phosporus concentration of sweet corn stover compared to manure plus charcoal

Peningkatan Kadar Sulfur Dan Selenium Hijauan Zea Mays Saccharata Oleh Pemupukan Fosfor Dalam Suspensi Fermentasi Acetobacter-saccharomyces Sulfur and Selenium Content Improvement of Zea Mays Saccharata with Phosphorus Fertilization in the Fermented Acetobacter-saccharomyces Solution

A greenhouse experiment was conducted during 6 weeks on acid latosolic soil and low phosphorus availability. A completely randomized design with 5 treatments and 4 replicates was used. The treatments were control, RP, SP, RP+FSAS, and SP+FSAS. Phosphorus fertilizer level was 200 kg P2O5/ha (2.96 g RP/pot or 2.22 g SP/pot). Sweet corn was cut and measured for S and Se content on 6 weeks after planting. All data were analyzed by the GLM procedure of SAS. Significant differences among the treatments were calculated by DMRT. The results show that SP+FSAS increased S and Se content significantly higher compared to control and RP (

Pertumbuhan dan Bobot Bahan Kering Rumput Gajah dan Rumput Raja pada Perlakuan Aras Auksin yang Berbeda

Urine sapi terdapat kandungan hormon auksin untuk merangsang pertumbuhan tanaman. Rumput gajah dan rumput raja adalah tanaman berkualitas unggul. Penelitian ini bertujuan pemanfaatan urine sapi betina sebagai sumber zat pengatur tumbuh pada tanaman, mengetahui kecepatan tumbuh, daya tumbuh, rasio tajuk dan akar, mengetahui titik optimal pertumbuhan kedua tanaman dari perlakuan aras urin sapi dan auksin sintetik. Penelitian telah dilaksanakan pada bulan Maret – Mei 2012 di lahan tanaman pakan Fakultas Peternakan dan Pertanian Universitas Diponegoro Semarang dan analisis bahan kering dilaksanakan di Laboratorium Ilmu Tanaman Makanan Ternak Fakultas Peternakan dan Pertanian Universitas Diponegoro Semarang. Hasil penelitian menunjukkan bahwa pemberian dosis urine sapi yang berbeda pada kedua tanaman tidak berpengaruh nyata terhadap kecepatan tumbuh, pertambahan tinggi, (P>0,01). Perlakuan jenis tanaman (R) berpengaruh sangat nyata terhadap perlakuan yang diujikan, kecuali pada uji rasio tajuk dan akar. Interaksi antar perlakuan (RxTy) tidak berpengaruh nyata pada uji kecepatan tumbuh, tetapi berpengaruh nyata terhadap daya tumbuh, tinggi tanaman (P<0,05) dan berpengaruh sangat nyata terhadap rasio tajuk dan akar (P<0,01). Daya tumbuh dan kecepatan tumbuh rumput gajah lebih tinggi dibandingkan rumput raja. Hasil penelitian disimpulkan perlakuan urine sapi berpengaruh terhadap pertumbuhan dan bobot bahan kering dengan hasil sesuai dengan hipotesis pada parameter tinggi tanaman

NUTRIENT UPTAKE IMPROVEMENT OF FORAGE LEGUMES BY ROCK PHOPHATE FERTILIZATION AND ARBUSCULAR MYCORRHIZAL FUNGI INOCULATION

A series of experiments were carried out during 25 months consisting of greenhouse and field experiments and laboratory analysis. Centro (Centrosema pubescens) and puero (Pueraria phaseoloides) were inoculated with arbuscular mycorrhizal fungi (AMF) and without AMF and were fertilized with rock phosphate (RP) at dosage of completely randomized design (CRD) in three replicates was used for greenhouse experiment and in completely randomized block design (CRBD) was used for field experiment. The significant difference among treatments was tested using Duncan Multiple Range Tests (DMRT). The results of greenhouse experiment showed that N and P uptake of puero were higher than centro. Nitrogen and P uptake of mycorrhizal legumes were higher than non-mycorrhizal legumes. 0, 100, 200, 300 and 400 kg P2O5/ha. Split in time in Rock phosphate fertilization increased N and P uptake of mycorrhizal legumes approximately 9, and 22 times than non-mycorrhizal legumes respectively. The result of field experiment showed that N and P uptake of centro and puero Increased after defoliation. However, N and P uptake of puero were higher than centro. Rock phosphate fertilization increased N and P uptake of legumes. Nitrogen and P uptake of legumes were not significantly different for both with or without AMF inoculation