Contaminated-agro ecosystem influences abundance and diversity of arthropods. The aims of this study were to analyze the diversity and abundance of pre-planting arthropod predators on wild plants in rice field with and without application of pesticides. The survey and direct observation of wild plants at the rice filed were conducted from January to March 2015, at 1 ha in Pemulutan and 1 ha in Musi 2 Palembang. Sampling of arthropod predator was conducted 8 times before the rice was grown, using insect nets. On the land without pesticide application was found 14 arthropod families which consists of 28 species and 15 families of wild plant consists of 25 species. On the land with pesticide application was found 8 arthropod families consists of 16 species and 15 wild plant families with 23 species. On the land without pesticide application was found High index of diversity (H'=3.121) and low dominance (D=0.095), while on the land with pesticide application low index of diversity (H'=2.602) and high dominance (D=0.171). It is the indicators of arthropods predator more varieties at the land without pesticide application compare to the land with pesticide application. This finding is very important for biological pest management in South Sumatra.
Diversity of arthropod predator in swamp rice fields in South Sumatera. The abundance and diversity of arthropod in agro ecosystem depend on the level of synthetic pesticide contamination. This study aimed to explore, identify and analyze the diversity and abundance of predatory arthropods in swamp rice fields treated with pesticide application (in Pemulutan) and without pesticide application (in Musi 2). The swamp rice fields in Pemulutan are bordered by village, river and forest. The methods were survey and direct observation on 3 ha and 2 ha of swamp rice fields in Pemulutan and Musi 2, Palembang. Sampling of predatory arthropods were conducted at 20, 50, 80 and 110 days after rice planting using pitfall trap. Identification of predatory arthropods was conducted at Laboratory of Entomology showing that the arthropod collected consisted of 17 species of insects and 9 species of Arachnida. In Pemulutan Ogan Ilir were found 19 species (10 species of insect and 9 species of Arachnida) at the village area. In the area that was bordered by river were found 8 species (7 insect and 1 Arachnida). In the area bordered by forest were found 22 species (10 species of insects and 12 species of Arachnida). The diversity level, number of species, and arthropod specimen in the field without pesticide application at Musi 2 were higher than those in the fields with pesticide application in Pemulutan. ABSTRAK Keanekaragaman artropoda predator sebagai bioindikator kesehatan tanah di sawah lebak di Sumatera Selatan.Kelimpahan dan keanekaragaman artropoda di agroekosistem sangat dipengaruhi oleh cemaran insektisida sintetik. Penelitian ini bertujuan untuk mengeksplorasi, mengidentifikasi dan menganalisis keanekaragaman dan kelimpahan Artropoda predator di pematang sawah lebak yang diaplikasikan pestisida (di Pemulutan) berbatasan dengan perkampungan, sungai dan hutan, serta pematang sawah lebak tanpa aplikasi pestisida (di Musi 2). Metode penelitian adalah survei pada pematang sawah lebak di Pemulutan Ogan Ilir seluas 3 ha dan Musi 2 Kota Palembang seluas 2 ha. Pengambilan sampel Artropoda predator dilakukan pada saat tanaman padi berumur 20, 50, 80 dan 110 hari setelah tanam (hst) dengan menggunakan pitfall trap. Identifikasi Artropoda predator dilakukan di Laboratorium Entomologi, Balai Karantina Kelas I Palembang. Pada lokasi Musi 2 ditemukan 26 spesies Artropoda predator di pematang sawah, terdiri dari 17 spesies dari kelas Insekta dan 9 spesies dari kelas Arachnida. Di lokasi penelitian Pemulutan Ogan Ilir, yaitu lahan yang berbatasan dengan perkampungan ditemukan sebanyak 19 spesies (10 spesies dari kelas Insekta dan 9 spesies dari kelas Arachnida). Lahan yang berbatasan dengan sungai ditemukan sebanyak 8 spesies (7 spesies dari kelas Insekta dan 1 spesies dari kelas Arachnida). Di lahan sawah yang berbatasan dengan hutan ditemukan sebanyak 22 spesies (10 spesies dari kelas Insekta dan 12 spesies dari kelas Arachnida). Tingkat keanekaragaman, jumlah spesies dan spesimen Artropoda predator yang ditemukan di pematang sawah pada ...
The aims of this study were to find out how the growth and yield of sorghum (Sorghum bicolor L.) responds to the application of bokashi fertilizer and got the best dose of bokashi fertilizer for growth and yield of sorghum. This study was designed using a Randomized Block Design (RBD) experimental method. Giving of bokashi fertilizer with various dosages in sorghum plants can give a good response to the growth and production of sorghum plants. Giving of bokashi fertilizer with a dosage of 15 tons/ha or equivalent to 6.48 kg/plot (P3) resulted better plant growth than other treatments, with an average plant height of 204.94 cm at the age of 56 days after planting (DAP), the number of tillers flat average 5.50 tillers at the age of 28 DAP, fastest flowering age was 55.75 DAP, average wet biomass 1710.25 g/plant, fresh weight cobs in average of 129.06 g/plant, average yield was 1892,50 g/plot, average of weight of 1000 seeds was 12.63 g. Giving of bokashi fertilizer with a dosage of 17.5 tons/ha or equivalent to 7.56 kg/plot (P4) resulted the number of leaves in average of 17.69 at the age of 56 DAP and panicle length average of 40.06 cm. Giving of bokashi fertilizer with a dosage of 10 tons/ha or equivalent to 4.32 kg/plot (P1) resulted the number of panicle branches in average of 46.75 branches.
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