Nitrogen (N) export from soils to streams and groundwater under the intensifying cropping schemes of the Pampas is modest compared to intensively cultivated basins of Europe and North America; however, a slow N enrichment of water resources has been suggested. We (1) analyzed the fate of fertilizer N and (2) evaluated the contribution of fertilizer and soil organic matter (SOM) to N leaching un...

We study a discrete time model of the growth of two species of plankton with competitive and allelopathic effects on each other N1(k + 1) = N1(k)exp{r1(k)− a11(k)N1(k)− a12(k)N2(k) − b1(k)N1(k)N2(k)}, N2(k + 1) = N2(k)exp{r2(k) − a21(k)N1(k) − a22(k) N2(k)− b2(k)N1(k)N2(k)}. A set of sufficient conditions is obtained for the existence of multiple positive periodic solutions for this model. The ...

A 3-year study was conducted in cornfield to evaluate how composted cattle manure application affects net global warming potential (GWP; the sum of nitrous oxide (N2O) and methane (CH4) minus net ecosystem carbon balance (NECB)) and greenhouse gas intensity (GHGI; net GWP per unit of plant biomass yield). In the first experiment, conducted from 2010 to 2012, five fertilization strategies that i...

Vanda is an economically important orchid that widely produced in Thailand. Usually, growers apply large amounts of fertilizer throughout the plant, covering leaves and roots to ensure good quality products. Nitrogen fertilizer, terms ammonium (NH4+) nitrate (NO3−), generally used as N source. In addition, nitrogen organic (glutamine) increasingly being promote rapid growth some plants. However...

By using the Newton interpolation formula, we generalize the recent identities on the Catalan triangle obtained by Miana and Romero as well as those of Chen and Chu. We further study divisibility properties of sums of products of binomial coefficients and an odd power of a natural number. For example, we prove that for all positive integers n1, . . . , nm, nm+1 = n1, and any nonnegative integer...

MARKETING BOARDS, FERTILIZER SUBSIDIES, PRICES, & SMALLHOLDER BEHAVIOR: MODELING & POLICY IMPLICATIONS FOR ZAMBIA By Nicole Marie Mason Grain marketing boards (GMBs), strategic grain reserves (SGRs), and fertilizer subsidies have experienced a renaissance in eastern and southern Africa over the last decade. Relatively little is known about how the re-emergence of GMBs/SGRs as major players in m...

A comparative study on the effect of chemical fertilizers and bio-fertilizers was done on growth and biochemical parameters in cucumber plant (Cucumis sativus L.). An experiment was conducted in randomized completely blocks design (RCBD) with four replicates. The treatment were (T1= control, T2= bio-fertilizer, T3= chemical and T4= combination treatment (biofertilizer and 1⁄2 chemical)) at Agri...

Schmidt decompositions of the quantum Fourier transform on C1 ⊗C2 are computed for all N1,N2 ≥ 2. The Schmidt decomposition is shown to be completely degenerate when N1 is a factor of N2 and when N1 > N2. This generalizes previous decompositions, found for N1 = N2 = 2 n [M. A. Nielsen, PhD Thesis, University of New Mexico (1998), Chapter 6; arXiv:quant-ph/0011036], and, more generally, for N1 =...