Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: N mineralization rate

Sortuj według:

Ogranicz wyniki do:

Pistia Stratiotes Utilization to Improve the Straw Compost Quality

Lestari Mahayu Woro, Sholihah Anis, Sugianto Agus

Journal of Ecological Engineering

2022

Vol. 23, nr 9

78--87

Pistia has no economic value. However, when mixed into straw compost, it tends to enhance its quality. Therefore, this study aims to determine how the Pistia mixture can improve the straw compost quality, thereby increasing rice production. The treatments consisted of soil (control) in values of P100, P75 + J25, P50 + J50, P25 + J75, J100, and NPK. The quality of compost observed was: N, P, K, C/N, lignin, polyphenols, cellulose, and organic matter content. N cumulative and N mineralization rate observed in the second stage was carried out at the incubation 1, 2, 4, and 8 weeks, N mineralization, N uptake, N absorption efficiency, growth, and yield as variables observed in the third stage. This research was conducted to determine the effect of adding a compost mixture with Pistia and straw towards the efficiency, growth, and production of upland rice plants. The results showed that the more Pistia mixed in the straw, the better the compost quality, growth, and yield above J100. N uptake was associated very strongly with the number of panicles and total dry weight of the plant.

Drained fens : comparison of nitrogen mineralization rate and biotic structures in two periods of secondary succession

Kajak A., Pętal J.

Polish Journal of Ecology

2001

Vol. 49, nr 3

261-270

The grassland on drained fens, differentiated by water holding capacity and soilorigin, derived from sedge-moss (SMP), tall-sedge (TSP) and alder peat (AP) were compared in terms of soil properties, N mineralization rate and composition of dominant microbial and faunal communities. Comparison was done for two periods of secondary succession: 15 (earlier or first period) and 30 years after drainage (later or second period). In both compared period soil properties remained significantly different between study sites, however differences in respect to biota were lower in the later period. In all compared sites in the second period a decrease was noted in soil moisture, pH and total C and N contents accompanied by an increase in bulk density and cation-exchange capacity. The periodically over-dried AP grassland differed significantly from moist grasslands, located on segde originated soils. The rate of nitrogen mineralization was the highest in AP soil in both periods compared, but decomposition of new, dead plant material was retarded. Amount of N accumulated in plant detrius accounted for 30, 42 and 91% of live plant biomass in compared SMP, TSP and AP sites, respectively. The low efficiency of soil organisms in the decomposition of detritus in AP soil may be illustrated by relations between invertebrate biomass and the amount of accumulated detrius. Nitrogen in soil invertebrates contributed to 81% of total N in litter in both sedge originated grasslands and to 19% only, in alter grassland. The decrease in the number of microbivorous and plant parasitic nematodes, stimulating mineralization processes was noted in AP soil in the second period. The density of humus forming invertebrates (Enchytraeidae, Lumbricidae) was significantly lower there in both periods. The paper focusses on historical processes to explain the discrepancy between low abundance of humus forming invertebrates and high humus content in alter soil.