A long-term field experiment utilis

A long-term field experiment utilising barley received four different treatments prior to sowing: municipal solid waste (MSW) compost at
either 20 t ha21 (C20) or 80 t ha21 (C80); cow manure (MA) at 20 t ha21; mineral fertilizer (MIN) or NPK (400 kg ha21); and NH4NO3
(150 kg ha21). The effects of these applications on soil enzyme activities and microbial biomass at crop harvest were measured after nine
years. In comparison with the control (no amendment) MSW addition increased biomass C by 10 and 46% at application rates of 20 and
80 t ha21, respectively, while MA treatment increased microbial biomass C by 29%. The ratio of soil microbial C to soil organic C was the
lowest at the high rate of MSW application. Oxidoreductase enzymes, such as dehydrogenase and catalase, were higher in the MSW
treatments by 730 (C20) and 200% (C80), respectively, and by 993 and 140% in MA treatments than in the unamended soil, indicating
an increase in the microbial metabolism in the soil as a result of the mineralization of biodegradable C fractions contained in the amendments.
The addition of MSW and MA caused different responses in hydrolase enzymes. Phosphatase activity decreased with MSW (^62% at both
rates) and MA (^73%), to less than those in the mineral fertilization and the control treatments. Urease activity decreased by 21% (C20) and
28% (C80), possibly being affected by the heavy metals contained in the MSW. However, b-glucosidase and protease-BAA increased in all
the organic treatments, especially with MA (by 214 and 177%, respectively). This is attributed to the microbial stimulation by the organic C
and is correlated with the increase in dehydrogenase …r2 ˆ 0:882† and catalase …r2 ˆ 0:654† activities. q 2000 Elsevier Science Ltd. All
rights reserved.

Results (Indonesian) 1:

A long-term field experiment utilising barley received four different treatments prior to sowing: municipal solid waste (MSW) compost ateither 20 t ha21 (C20) or 80 t ha21 (C80); cow manure (MA) at 20 t ha21; mineral fertilizer (MIN) or NPK (400 kg ha21); and NH4NO3(150 kg ha21). The effects of these applications on soil enzyme activities and microbial biomass at crop harvest were measured after nineyears. In comparison with the control (no amendment) MSW addition increased biomass C by 10 and 46% at application rates of 20 and80 t ha21, respectively, while MA treatment increased microbial biomass C by 29%. The ratio of soil microbial C to soil organic C was thelowest at the high rate of MSW application. Oxidoreductase enzymes, such as dehydrogenase and catalase, were higher in the MSWtreatments by 730 (C20) and 200% (C80), respectively, and by 993 and 140% in MA treatments than in the unamended soil, indicatingan increase in the microbial metabolism in the soil as a result of the mineralization of biodegradable C fractions contained in the amendments.The addition of MSW and MA caused different responses in hydrolase enzymes. Phosphatase activity decreased with MSW (^62% at bothrates) and MA (^73%), to less than those in the mineral fertilization and the control treatments. Urease activity decreased by 21% (C20) and28% (C80), possibly being affected by the heavy metals contained in the MSW. However, b-glucosidase and protease-BAA increased in allorganik perawatan, terutama dengan MA (oleh 214 dan 177%, masing-masing). Hal ini disebabkan stimulasi mikroba oleh C organikdan berkorelasi dengan peningkatan dehidrogenase r2 0:882 dan catalase r2 0:654 aktivitas. q 2000 Elsevier Science Ltd semuahak reserved.

Results (Indonesian) 2:

Sebuah barley percobaan lapangan jangka panjang memanfaatkan menerima empat perlakuan yang berbeda sebelum menabur: limbah padat (MSW) kompos di
salah 20 t ha21 (C20) atau 80 t ha21 (C80); kotoran sapi (MA) pada 20 t ha21; pupuk mineral (MIN) atau NPK (400 kg ha21); dan NH4NO3
(150 kg ha21). Efek dari aplikasi ini pada aktivitas enzim tanah dan biomassa mikroba pada saat panen tanaman diukur setelah sembilan
tahun. Dibandingkan dengan kontrol (tanpa amandemen) Selain MSW meningkat biomassa C dengan 10 dan 46% pada tingkat penerapan 20 dan
80 t ha21, masing-masing, sedangkan perlakuan MA meningkat mikroba biomassa C sebesar 29%. Rasio tanah mikroba C ke tanah organik C adalah
terendah di tingkat tinggi aplikasi MSW. Enzim oksidoreduktase, seperti dehidrogenase dan katalase, lebih tinggi di MSW
perawatan oleh 730 (C20) dan 200% (C80), masing-masing, dan dengan 993 dan 140% dalam perawatan MA daripada di tanah belum diamandemen, menunjukkan
peningkatan mikroba metabolisme dalam tanah sebagai akibat dari mineralisasi dari fraksi C biodegradable yang terkandung dalam amandemen.
penambahan MSW dan MA menyebabkan respon yang berbeda dalam enzim hidrolase. Kegiatan fosfatase menurun dengan MSW (^ 62% di kedua
tingkat) dan MA (^ 73%), kurang dari yang di fertilisasi mineral dan perlakuan kontrol. Aktivitas urease menurun sebesar 21% (C20) dan
28% (C80), mungkin dipengaruhi oleh logam berat yang terkandung dalam MSW. Namun, b-glukosidase dan protease-BAA meningkat di semua
perawatan organik, terutama dengan MA (oleh 214 dan 177%, masing-masing). Hal ini dikaitkan dengan stimulasi mikroba oleh C organik
dan berkorelasi dengan peningkatan dehidrogenase ?? r2 ?? 0: 882 ?? dan katalase ?? r2 ?? 0: 654 ?? kegiatan. q 2000 Elsevier Science Ltd. All
rights reserved.