Given the potential for high amounts of variability in yield-affecting soil factors, some property or properties may serve as a basis site-specific management. The objectives this study were to determine selected and relationships between these soybean [Glycine max (L.) Merr.] yield. Soil samples collected from center point 0.5-ha grids three fields analyzed soil-test-extractable Ca, Mg, K, P, pH water, texture. Relative elevation, slope, aspect, yield also determined at points. Coefficient...

Soil samples were collected on a 0.4ha (1.0ac) grid from two agricultural fields in northeastern Mississippi.The measured for soil nutrient composition, texture, and diffuse reflectance between 250 2500 nm. Thedata examined purposes: (1) to understand the relationships properties spectra,and (2) sources of variability spectra. From raw spectra, 50nmbandaverages calculated. There significant correlations groups averaged spectra properties,but no single 50nm band was highly correlated any...

A study was conducted to compare and correlate the Mehlich 3 soil extraction method with Lancaster method. This compared calcium (Ca), magnesium (Mg), potassium (K), phosphorus (P) concentrations in 422 samples from eight fields, which varied greatly type, texture, fertility. Each sample consisted of 10 subsamples collected 0 15 cm deep. Soil fertility determined using both test Ca, Mg, K, P extracted by two methods were linear regression. The consistently higher nutrients than did for low...

Abstract Separate studies found canola tolerant to arsenic (As) when grown in hydroponic solutions and generally sensitive As soil. Fourteen‐day‐old was transferred pots containing either soil or nutrient solution then for an additional 14 days a growth chamber at different times the two media. Plants were 0.25‐strength Hoagland's 0, 0.27, 6.67, 13.3μM three soils with added rates of 0,5, 10 mg.kg‐1. Soil‐solution concentrations determined via column displacement same less (0.147 4.27μM)...

Field experiments were conducted in 2009 and 2010 Louisiana Mississippi to evaluate ammonia volatilization loss subsequent effects on apparent nitrogen recovery efficiency (ANRE) grain yield for rice ( Oryza sativa L.). A semi‐open static chamber approach was used measure from multiple N sources applied 10 days before flood (dbf) at the rate of 168 kg ha −1 . Cumulative losses urea environments 19 33% compared 7% both environments. Urea + [N‐(n‐butyl) thiophosphoric triamide] (NBPT), NBPT...

Soil biological properties are important for the stabilization and preservation of a good soil structure. Management practices can affect diversity population microorganisms, which could beneficially change promote more sustainable dryland crop production. This study was established near Pontotoc, MS, USA (34°07′ N, 88°59′ W) on an Atwood silt loam (fine-silty, mixed, semiactive, thermic Typic Paleudalf) to evaluate impacts cover crops, planting dates fertilizer sources (poultry litter,...

Greenhouse studies were conducted to evaluate the influence of nitrogen (N) sources [urea + ​N-(n-butyl) thiophosphoric triamide, NBPT (urease inhibitor) and polymer-coated urea (PCU)] rates on soybean root characteristics, nodule formation, biomass production two soil types (silt loam clay) commonly cropped in Mississippi. About 15% less belowground was produced clay than silt directly corresponding all other parameters including length, area, diameter, number. Pooled across N rates,...

In 1998 and 1999, two soil series representative of a large percentage rice ( Oryza sativa L.) growing hectarage in the Mississippi Delta were sampled increments to depth 120 cm. Measurements made determine how extractable levels Ca, K, Mg, Na, P, Zn as well total N content pH varied with respect profile depth. Total N, Zn, all tended decrease while Na increase. Only small differences seen Mg K concentrations. An on‐farm study was conducted 2000 2001 further investigate effects precision...

Seeding rate and N application strategies have been extensively researched for drill‐seeded, delayed flood rice ( Oryza sativa L.) production in the midsouthern United States. However, little economic analysis has performed to determine effects of seeding fertilization on high‐yielding, lodging susceptible cultivars. The purpose this research was effect multiple rates grain yield use data optimal management practices based evaluation returns. Studies were established Louisiana Mississippi...

Studying historical response of crops to weather conditions at a finer scale is essential for devising agricultural strategies tailored expected climate changes. However, determining the relationship between crop and in Mississippi (MS) remains elusive. Therefore, this research attempted i) estimate trends 1970 2020 MS during soybean growing season (SGS) using Mann-Kendall Sen slope method, ii) calculate impact change on yield an auto-regressive distributive lag (ARDL) econometric model,...

Abstract Climate change poses a significant threat to agriculture. However, climatic trends and their impact on Mississippi (MS) maize ( Zea mays L.) are unknown. The objectives were to: (i) analyze in variables (1970 2020) using Mann–Kendall Sen slope method, (ii) quantify the of climate yield short long run auto-regressive distributive lag (ARDL) model, (iii) categorize critical months for maize-climate link Pearson’s correlation matrix. considered maximum temperature (Tmax), minimum...

Because Great Lakes sport fish are contaminated with several toxicants, the states individually issue advisories, principally based on Food and Drug Administration (FDA) action levels, that suggest limiting or eliminating consumption of fish. We describe procedures use to determine when advisories we evaluate associated cancer risks using EPA-IARC-OSTP risk assessment procedures. Projected high for consumers small quantities DDT dieldrin at their respective levels. concentrations common but...

Rice ( Oryza sativa L.) is an important crop in the midsouthern United States. However, some high‐yielding cultivars are highly susceptible to lodging. The plant growth regulator, trinexapac‐ethyl (TE), has been shown decrease lodging upland cereal crops, but data scarce that demonstrate rice response TE. objective of this study was determine effect TE on height, lodging, and grain yield. Experiments were established at multiple locations during 2012 2013 growing seasons Mississippi....

For site-specific soil management to be effective, factors must vary within a field and potentially limiting crop production. The objectives of this two-year study were the following: (i) determine amount variability in selected physical chemical properties three typical Mississippi fields (ii) which factor or influencing yields. Three sampled on 1-ha grid analyzed for pH water (1:1), Ca, K, Mg, Na, P, clay content, elevation. Variability parameters, as evidenced by coefficient variation...

Multiyear yield data may lead to more accurate determination of yield–soil relationships. This study was conducted determine if stable classification zones could be found, soil and/or topographical properties differed among classifications, and used classify field locations into classes. Soybean ( Glycine max L.) yields over 4 yr in three fields were classified four zones: consistent‐high, consistent‐average, consistent‐low, inconsistent. Soil samples from all except the inconsistent zone...

Polyacrylamides (PAMs), when applied as a soil amendment, purportedly improve infiltration, decrease erosion, and reduce offsite agrochemical transport. The effect of PAM on transport, crop yield in furrow to mid-southern US production systems has not been evaluated. objective this study was assess effects corn ( L.) grain yield, nitrogen (N) phosphorus (P) transport at 10 mg L through lay-flat polyethylene tubing. A 2-yr field conducted the Mississippi State Delta Research Extension Center...

An understanding of environmental factors governing patchy weed distribution in fields could prove to be a valuable tool management. The objectives this research were investigate the relationships between patterns and properties two Mississippi soybean construct models based on those predict distribution. Two months before planting, soil sampled 60- by 60-m coordinate grid, samples analyzed for calcium, magnesium, potassium, sodium, phosphorus, zinc, cation exchange capacity, percent organic...