Application of Landfill Leachate Improves Wheat Nutrition and Yield but Has Minor Effects on Soil Properties

Abstract

Landfill leachates, which are potential pollutants, may also carry significant amounts of nutrients that can be recycled by plants. We assessed the nutritional status and yield of wheat ( L.) and properties of a Rhodic Kandiudult soil (depths of 0-10, 10-20, 20-40, and 40-60 cm) after 11 applications of landfill leachate over 4 yr. In the last application, wheat received 0, 32.7, 65.4, 98.1, or 130.8 m ha (875 mg L of nitrogen, N) of leachate and a positive control (90 kg ha of N as urea) 15 d after sowing. Urea increased nitrate (>160 mg kg) in the topsoil (down to 40 cm), whereas landfill leachate increased nitrate (>60 mg kg) only at 40 to 60 cm with the highest dose, suggesting leaching. Urea-treated soil had less negative ΔpH, which might have led to greater retention of nitrate in the topsoil. Sodium (0.02-0.26 cmol Na kg), potassium (0.18-0.82 cmol K kg), and electrical conductivity (0.05-0.14 dS m) all increased with leachate dosage. Treatments did not affect resistance to penetration and clay dispersion. Basal respiration increased with leachate dosage, whereas dehydrogenase activity decreased, suggesting effects on soil microbial metabolism. Microbial biomass and soil enzyme activities were not affected by addition of leachate. Nitrogen nutrition (15.1-22.7 g N kg in flag leaves) and grain yield (1381-2378 kg grain ha) increased with leachate dosage so that the highest dose gave results similar to those for urea-treated plants (2563 kg grain ha). Landfill leachate showed strong potential as source of N for wheat but caused none, or transient, effects on soil properties. However, nitrate from leachate was more leachable than nitrate from urea.

Potential toxicity of landfill leachate to zebrafish and mung beans

“…The leachate contains rich organic matter, nitrogen, phosphorus, potassium and manganese, is a nutrient element of plants, and therefore, these nutrients may play a key role in the growth of plants when plants are exposed to lower levels of leachate. However, as the exposure concentration increases, various contaminated components in the leachate may enter and accumulate in plant cells, and therefore, the activity of several enzymes in chlorophyll biosynthesis may be suppressed due to inhibition of chlorophyll synthesis (Kuwano et al, 2017). Our results demonstrated that low levels of leachate increases chlorophyll content, which is due to the effects of nutrients of diaphragm.…”

Pengenalan Metode Ember Tumpuk Sebagai Upaya Pengolahan Sampah Organik Rumah Tangga Di Kawasan Perkotaan

“…Larutan lindi juga dapat berperan sebagai bahan pengurai penganti EM-4 dan MOL, karena mengandung mikroorganisme yang bermanfaat bagi tanaman dan juga sebagai bahan perombak. Selain mengandung mikroorganisme yang baik, lindi yang termodifikasi dengan waktu fermentasi juga mengandung nutrisi yang baik bagi tanaman (Kuwano et al, 2017).…”

Maize yields and carbon pools in response to poultry litter, rock phosphate and P-solubilizing microorganisms

“…In the fall, the highest cob yields were achieved with the combination of PL+RP applied in a ratio of 2:1 (Figure 3C). The use of organic residues on agricultural soil can be an alternative for organic production for oat biomass nutrition, maize grain yield (Panchoni et al, 2016) and wheat nutrition (Kuwano et al, 2016).…”