The experimental site has eight plots managed under a NT system with two
crop rotations: 2 years of corn-soybean and 4 years of corn-soybean-winter wheat-oat.
With regard to protein content,
crop rotation of amaranth after yard long bean and amaranth after winged bean, showed significantly higher amounts of protein compared to control but there was no significant difference when compared with the
crop rotation of amaranth after bush bean.
Amongst
crop rotations; the R-L rotation demonstrated higher ALP activities (158.50 and 160.93 [micro]g PNP released /g soil/hr in rabi and kharif) compared to R-M and R-W cropping system.
The results showed that under all
crop rotations the active erosion segments had significantly (P [less than or equal to] 0.05) lower soil pH compared with other segments.
A positive effect of
crop rotation on soil microbiota is observed in the change of the population of agronomically valuable group of microorganisms, such as the cellulose-digesting microorganisms.
Crop rotation results in increased yields, although scientists are not sure exactly why.
Inorganic P fractions were generally greater in the topsoil (0-0.1 m) of the direct drill treatment than the conventional tillage treatment (P < 0.05), irrespective of
crop rotations. Tillage and
crop rotation had little effect on resin-Pi and NaOH-Pi fractions in soil below 0.1 m.
Crop rotations that include nitrogen fixing legumes such as alfalfa and soybean can add nitrogen to the soil for the growth of subsequent crops (Figure 12-3).
arvensis PGR over the
crop rotations was described by semivariograms.
In that area, one farm has relied on
crop rotations and native soil fertility for plant nutrients ever since it was first plowed in 1909.
Five years after replacing long-term rice monoculture of three rice crops per year (RRR) with rice upland
crop rotations (RUR and RUU) or continuous cultivation of upland crops (UUU), effective changes were observed in total soil carbon stocks among cropping systems (Table 5) and in SOC concentrations and stocks among cropping systems for each soil depth (Figs 1, 2).
The examinations were carried out in two
crop rotations under non-irrigated conditions with average crop protection in the control and the N150+PK fertilizer treatments.
