The effect of southern corn leaf blight caused by disease severities assessed at the dough stage in each year. Helminthosporium maydis race T on corn in Texas male-Regression coefficients were 0.69 in 1975 and 0.70 in 1976 (R 2 sterile cytoplasm was investigated in the field in 1975 and = 86.3 and 87.0%, respectively). Values for y-intercepts for 1976. Losses in yield of grain due to infection initiated late in these equations were not significantly different from zero (P the season were 9.7 to 11.7%. There was no significant = 0.05). Various transformations and multiple regression difference (P = 0.05) between yield in the delayed-inoculation techniques were attempted but they did not enhance treatment and controls in 1975 but there was a significant precision in the analysis. A generalized equation to predict difference in 1976. Losses observed in treatments inoculated yield loss was presented; ^ = 0.69x0; where 9 is the percent prior to anthesis were about 30%. Regression analysis was yield loss and x0 is the percent diseased tissue at the dough used to determine the relationship of percent yield loss and stage. A method to estimate losses from disease assessments disease severities recorded at different stages in the growth of made prior to the dough stage using projected disease the crop. The best regression equation was derived from severities is presented.
Pot experiments were carried out to study the comparative efficiency of individual and combined application of organic manures (vermicompost, cowdung, neem cake) and biofertilizer on growth, biochemical properties and yield of cotton, Gossypium hirsutum L. in botanical garden, Department of Botany, Government Arts College, Musiri. Treatments were organic manures, single, combined application biofertilizer and control (without manures). The obtained results revealed that the response of cotton plant (Gossypium hirsutum L.) showed more significantly increased germination, growth and biochemical characteristics in combined inoculation of different organic manures (biofertilizer + vermicompost + cowdung + neem cake). The minimum germination, growth and biochemical characteristics were observed in the control. On the whole, combined application of organic manures increased the qualitative and quantitative properties of cotton plant significantly when compared to control. K e y w o r d s Biofertilizers Biochemical properties Gossypium hirsutum Organic manure VermicompostHow to cite this article:
Kajian mengenai perairan darat yang berhubungan dengan isu deposisi asam di Situ Patenggang telah dilakukan oleh Pusat Penelitian dan Pengembangan Sumber Daya Air (PSDA) dan Pusat Penelitian dan Pengembangan Kualitas dan Laboratorium Lingkungan (P3KLL) sejak tahun 1999. Tujuan kegiatan ini adalah untuk mengetahui dampak deposisi asam terhadap kualitas parameter kimia di Situ Patenggang pada 2010-2017. Situ Patenggang yang berlokasi di Rancabali-Ciwidey, Kabupaten Bandung merupakan salah satu dari dua lokasi pemantauan permukaan darat di Indonesia. Pemantauan berkelanjutan dibutuhkan untuk mengumpulkan data dasar dan untuk mengevaluasi kondisi terkini. Prosedur sampling, analisis, dan jaminan sistem mutu pengujian mengacu pada Panduan Teknis untuk Permukaan Darat dari The Acid Deposition Monitoring in East Asia (EANET). Parameter kualitas air seperti pH, temperatur, konduktivitas, transparansi, alkalinitas, oksigen terlarut, kation NH 4 + , Na + , Ca 2+ , Mg 2+ , K + , dan anion SO 4 2-, NO 3-, Cldiujikan di dalamnya. Hasil kajian menunjukkan bahwa selama 2010-2017, pH rerata Situ Patenggang adalah 7,6 dengan variasi dari 6,7 sampai 8,1, nilai konduktivitas dan alkalinitas rerata masing-masing adalah 6,73 mS/m dan 0,44 meq/L. Konsentrasi ion-ion dominan dalam perairan Situ Patenggang adalah SO 4 2-sebesar 7,4 mg/L, Ca 2+ sebesar 5,7 mg/L, Na + sebesar 3,6 mg/L dan Clsebesar 2,3 mg/L. Selama pengamatan, dampak deposisi asam di perairan Situ Patenggang belum ditemukan secara nyata.
Studi Awal Sumber Deposisi Basah di Serpong, Jakarta, dan Kotatabang Menggunakan Model PMF. Pertumbuhan ekonomi di Indonesia telah memicu kegiatan industri dan transportasi yang berpotensi menimbulkan pencemaran udara. Reaksi kimia senyawa asam dari polusi udara dengan air dan oksigen menghasilkan polutan yang lebih asam di atmosfer. Deposisi asam merupakan masalah lingkungan lintas batas karena polutan dapat tetap berada di atmosfer untuk waktu yang lama dan dapat menyebar hingga ribuan kilometer melintasi batas negara dan jauh dari sumber asal emisi. Pemantauan dilakukan di 3 (tiga) daerah yaitu mewakili daerah pedesaan (Serpong), daerah perkotaan (Jakarta), dan daerah terpencil (Kotatabang). Pengolahan data menggunakan konsep matematika untuk mengkorelasikan ion atau elemen dalam sebuah matriks, model Positive Matric Factorization (PMF). Analisis dataset dilakukan terhadap data pemantauan komponen air hujan pada tahun 2015 hingga 2019. Contoh uji dikumpulkan melalui sampling deposisi basah dan dianalisis menggunakan metode kromatografi ion. Deskripsi potensi sumber diperoleh berdasarkan tipikal sumber pencemar. Hasil analisis menggunakan PMF diperoleh sumber pencemar di Serpong berasal dari tanah dan debu, kontribusi air laut, pertanian, pembakaran biomassa, dan proses pembakaran. Jakarta menunjukkan lima sumber pencemar yang dominan yaitu tanah dan debu, kontribusi laut, sumber pertanian, proses pembakaran serta pembakaran biomassa. Kotatabang juga menunjukkan lima sumber pencemar yang dominan yaitu kontribusi laut, pembakaran biomassa, proses pembakaran, sumber pertanian, tanah dan debu. Oleh karena itu, disimpulkan bahwa sebagian besar sumber pencemar dipengaruhi oleh aktivitas antropogenik. Dengan mengetahui karakteristik sumber pencemar diharapkan penanganan sumber pencemar lebih objektif.
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