Economic losses due to infestation by the soybean armyworm, Spodoptera litura can reach up to 100%. Some farmers often used insecticide to control the armyworm. However, regular use of insecticide can cause several negative effects such as environmental pollution, residual toxicity, and health hazard for human. The objective of this research was to determine the larvicidal, antifeedant, and activities of clove leaf oil (CLO) against the armyworm S. litura on soybean. The research was carried out at the plant pest control laboratory of Politeknik Pembangunan Pertanian Malang. Clove leaf oil was evaluated for its larvicidal and antifeedant activities against ten third instar larvae of the armyworm. Completely randomized design was used with concentration levels of CLO as treatments. i.e. 0.4, 0.5, 0.67, 1.0, and 2.0% by volume. Profenofos 500 g L 0.1% and distilled water were include as control. Each treatment consisted of five replications. Mortality of the larvae and antifeedant activity were analyzed using analysis of variance, followed by probit analysis for calculating LC 50 and LT 50 -1. The results showed that CLO at 2.0% concentration was the most effective with regard to larvicidal and antifeedant activities. The LC 50 of CLO was 0.09% with LT 24.6 hours. This study revealed that the environmentally friendly CLO can be used as an alternative to synthetic insecticide for control S. litura.
The use of inorganic fertilizers combined organic fertilizer is commonly applied by farmers to increase shallot production. Research was conducted to determine the proper dosage of organic fertilizer which can reduce the use of inorganic fertilizer. The research was conducted at Tawangargo Village, Karangploso district, Malang. The fertilizers were organic fertilizers, enriched with N-fixing bacteria and P solvent bacteria. The research used RCBD where the treatments were combinations of organic and inorganic fertilizers. The dose of organic fertilizer enriched functional microbes was set at 2 t/ha, while the dose for inorganic fertilizer is a combination of 600 kg/ha NPK+200 kg/ha SP36+400 ZA+100 kg/ha ZK. As comparison, farmers applied organic fertilizer from cow manure and without fertilization as control. The results showed that standard dose 100% inorganic fertilizer (1,300 kg/ha) + 100% standard dose (2,000 kg/ha) microbial-enriched organic fertilizer increased RAE 2% that produced 12.50 t/ha dry shallots in comparison with the farmer control. By dose of 2 t/ha of organic fertilizer enriched with functional microbes, the results will be equivalent to local organic fertilizer of 10,000 kg/ha and it is more effective than local organic fertilizers from cow manure.
Jagung manis sebagai komoditas penting dan selalu diminati konsumen karena rasa manis serta kandungan nutrisi dimilikinya. Tanaman ini dapat tumbuh pada hampir seluruh jenis tanah terutama yang menggunakan olah tanam minimum yang mampu menyediakan kebutuhan hara dengan baik. Pentingnya pemberian pupuk kandang untuk perbaikan kadar hara dalam tanah diharapkan mampu memenuhi kebutuhan hara jagung manis yang ditanam di lahan yang memiliki frekuensi tinggi untuk penanaman. Penelitian ini bertujuan untuk mengetahui produksi tanaman jagung manis pada perbedaan interval aplikasi konsorsium bakteri endofit dan penggunaan berbagai jenis pupuk organik. Penelitian dilaksanakan di Desa Bedali, Kecamatan Lawang, Kabupaten Malang yang berlangsung mulai bulan Agustus 2019 sampai Desember 2019. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) faktorial dengan dua faktor. Faktor pertama yaitu jenis pupuk kandang sedangkan faktor kedua adalah interval pemberian konsorsium bakteri endofit. Hasil pengukuran bobot tongkol menunjukkan bahwa pemberian kombinasi pupuk kandang sapi dan interval aplikasi konsorsium bakteri endofit dengan interval 5 hari sekali, menunjukkan hasil paling baik. Bobot per tongkol berkisar antara 203 gram sampai dengan 225 gram. Jika dikonversikan dalam bedengan (9 m2 populasi tanaman 60 tanaman) proyeksi hasilnya adalah 13,5 kg atau dalam luasan 1 ha sekitar 15 ton per ha.
The purpose of this study was to determine the response of growth and productivity of tomato plants to the application of various doses of local microorganisms obtained from fruit waste. The study used a completely randomized design with 4 treatments and 6 replications. Observation parameters consisted of plant height (cm), number of leaves (strands), productivity (grams), and number of fruits. The best application results were at a dose of 30 ml per plant. The parameter of plant height at a dose of 30 ml produced an average of 114.83 cm, the parameter of the number of leaves produced an average of 190.83 strands, then the parameter of the number of fruits produced an average of 7.5 pieces, and the last parameter was the average fruit weight -an average of 446.16 grams. MOL affects the growth and productivity of tomato plants because it contains macro and micro nutrients and contains various microbes that are beneficial to plants.
Keywords: dosage, MOL application, tomato growth, tomato productivity
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