Variation in available micronutrients in black soil after 30-year fertilization treatment

Abstract

To assess the effects of long-term fertilization on soil available micronutrients in farmland, this study examined diethylenetriaminepentaacetic acid (DTPA) extractable iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn) in surface soil with monoculture of corn (Zea mays L.) with a 30-year filed fertilization experiment established in Northeast China. Treatments included no fertilization (CK); nitrogen only (N); nitrogen and phosphorus only (NP); NP and potassium (NPK); NPK plus cornstalk (SNPK), and NPK plus farmyard manure (MNPK). Results showed that DTPA-Fe and Mn were significantly increased with chemical N application, and DTPA-Cu and Zn were significantly increased with farmyard manure amendment, while micronutrients were not significantly different between treatment SNPK and CK. DTPA-Fe and Mn were about twice to threefold in treatments N, NP, and NPK as much as in treatments SNPK, MNPK and CK. DTPA-Cu and Zn in treatment MNPK were about 3.9 and 6.5 times as much as in CK. DTPA-Fe and Mn decreased with the increasing of soil pH and cation exchange capacity, while DTPA-Cu and Zn increased with the increase of soil organic carbon and electrical conductivity.

Phosphate Fertilizer Type and Liming Affect the Growth and Phosphorus Uptake of Two Maize Cultivars

“…The inoculation of RP with phosphate-solubilizing bacteria could be a another way to increase the P-availability of RP, as shown by the 55% higher shoot biomass of maize compared with the application of DAP [38,39]. The addition of phosphate-solubilizing bacteria decreased the soil pH (8.2 to 7.7) and increased plantavailable P (74%) mainly by acid and alkaline phosphatase and dehydrogenase enzyme activities [38,40,41]. The effectiveness of phosphate-solubilizing bacteria is, however, still difficult to generalize, given the effect of local site conditions and the limited number of studies conducted under field conditions [42].…”

Ecological Stoichiometry Homeostasis of Six Microelements in Leymus chinensis Growing in Soda Saline-Alkali Soil

“…Generally, Mn, Fe, Ni, Cu, Zn, and Mo contents of healthy plants are reportedly 50-200, 100-300, 1-5, 5-20, 25-150, and 0.1-1.0 mg/kg, respectively [33,34]. As shown in Table 2, average contents of these elements in the sampled L. chinensis plants were 32.9, 421, 1.30, 7.06, 17.8, and 0.77 mg/kg, respectively.…”

Study of Correlation between Soil Chemical Properties, Zinc Fractions and Yield of Rice under Long Term Fertilization in Chromustert Soil

“…In this context, the significant correlation coefficient values (r) were obtained with all the parameters showed that organic carbon content in soil predominantly affected almost all individual fractions that ultimately maintain the pool of total Zn in soil for uptake by crop plants. This directly contributed to the available fraction in the root zone [14,15]. Moreover, the correlation study also revealed the direct contribution of Org-Zn fraction with available Zn [16,17].…”

“…The total Zn fraction in Table 3(a) and 3(b) showed a positive and significant relationship with organic carbon (r=0.80**), available nitrogen (r=0.82**), available phosphorous (r=0.85**), grain (r=0.84**) and straw (r=0.85**) yields while a positive and significant relationship with available potassium (r=0.67*) and available Zn (r=0.62*) was also observed. This could probably by reason of the fact that the OC directly involved in the availability of almost all fractions of Zn in soil system that directly contributed to pool of Zn [15,10] and prevent the conversion into a nonavailable form there by promoting the availability of Zn to a optimum level [22,[29][30][31][32][33][34][35][36][37][38][39].…”