Plant available N supply and recalcitrant C from organic soil amendments applied to a clay loam soil have correlations with amendment chemical composition

Although composted liquid pig manure is increasingly being applied to agricultural soils, little is known about its impacts on N dynamics (mineralization, denitrification, immobilization, and plant uptake) in the crop root zone compared to liquid pig manure (LPM) or other types of composts. A greenhouse pot experiment was conducted to determine N mineralization and plant uptake in a ryegrass-cropped clay loam soil that had been amended with either LPM, LPM + wheat straw compost (PMS), or yard waste compost (YWC). Over a 20-wk growth period, plant biomass was increased relative to the control by 164% for LPM, 64.3% for YWC, and 39.6% for PMS. However, the recovery of amendment N in the ryegrass was low and variable at 3.3% for PMS (12.7 mg N kg-1), 3.7% for YWC (21.5 mg N kg-1), and 15.3% for LPM (90.9 mg N kg-1). Although gains and losses of mineral N occurred primarily within the first 8 wk, assimilation of amendment N by the ryegrass appeared to continue throughout the entire growth period. High amounts of inorganic N present in the LP M treatment led to the greatest loss of N, as N2O, through denitrification and nitrification (39.1 mg N kg-1). This was 35 times greater than the YWC treatment (1.1 mg N kg-1), over 50 times greater than the N2O loss from the PMS treatment (0.7 mg N kg-1) and over 76 times greater than the N2O loss from the control (0.5 mg N kg-1). There was a net gain in mineral and plant assimilated N from mineralization with the control (6.4 mg N kg-1) and YWC treatments (8.8 mg N kg-1) over 20 wk. However, there was a small decrease in mineral and plant assimilated N with the PMS treatment (4.3 mg N kg-1) and a large decrease with the LPM treatment (90.1 mg N kg-1). From an environmental perspective, the large amount of N2O generated by the LPM treatment compromises the usefulness of LPM as a source of crop-available N. Key words: Compost, pig manure, ryegrass, swine, hog, nitrogen mineralization

Download Full-text

Effect The Treatments of Biofertilizer and Mineral Fertilizer on Content of N P K of Soil Cultivated With Crop Corn (Zea Mays L).

Al-Qadisiyah Journal For Agriculture Sciences (QJAS) (P-ISSN 2077-5822 E-ISSN 2617-1479) ◽

10.33794/qjas.vol9.iss2.89 ◽

2019 ◽

Vol 9 (2) ◽

pp. 247-256

Author(s):

Mohammed Aajmi Salman ◽

Jawad A. Kamal Al-Shibani

Keyword(s):

Zea Mays ◽

Zea Mays L ◽

Mineral Fertilizer ◽

Silty Clay ◽

Clay Loam ◽

Potassium Fertilizer ◽

Clay Loam Soil ◽

Silty Clay Loam ◽

Fall Season ◽

Loam Soil

Beneficial microorganisms play a key role in the availability of ions minerals in the soil and use Randomized Complete Block Desing ( R.C.B.D ). The objective of this paper to the study effect of the of biofertilizer and miniral treatments on availability of NPK for crop corn zea mays L.Two types of biofertilizer are Bacterial Bacillus subtilis and Fungal Trichoderma harianum. Three levels of potassium fertilizer are (2.9533, 0.4000 and 2.9533). A field experiment in fall season of 2018 Has been conducted in silty clay loam soil. The experimental Results indicated that Bacillus and Trichoderma inoculation separately or together Have made a significant effect to increase in the availability of N P K in the soil compare to other treatments. The grain yield is where (2.9533, 0.4000 and 2.9533) of bacterial and fungal bio-fertilizer and potassium fertilizers respectively as compared to the control.

Download Full-text