Soybean macronutrient availability and yield as affected by tillage system

Abstract

The effect of tillage system (NT-no tillage; CT-conventional tillage; MT-minimum tillage; and NT/scarification, every three years) on soybean nutrient availability and yield was evaluated on Oxisol after 12 years of cultivation. Soil samples were collected at depths of 0.00-0.05, 0.05-0.10, and 0.10-0.20 m and were analyzed for P, K, Ca, Mg, carbon (C), organic matter (OM), pH value, potential CEC, base saturation (BS%), and number of semiquinone organic radicals. The macronutrient concentration in the leaves and amount accumulated in the plants at the blooming stage were determined, as well as the yield of the two soybean crops. The soil pH value, BS% and K, Ca, and Mg concentrations were not influenced by the tillage system. The soil P and OM in the surface layer, however, were inversely proportional to the intensity of soil preparation. The P content in the soil surface layer under NT was twice as high as that of soil under CT. The P content in the soybean leaves under NT was also higher compared to that in the plants under CT and MT. The number of semiquinone radicals was low in the soil surface layer under NT, indicating a small degree of humification. However, soybean yield was not affected by the tillage system.

Soybean off-season management practices: impacts on physical and chemical soil properties and crop yield

“…The absence of response due to MT can be attributed to the lack of compacted soil layers capable of limiting soybean development, as also observed by Moreira et al (2019) and Santos et al (2019). A similar result was found by Secco et al (2009) and Franchini et al (2012),…”

“…There was also a reduction of Ca in M/O and K and P in M and M+B systems in depth (0.1-0.3 m) with MT (Table 5). Results from Moreira et al (2019), also showed a reduction of some nutrients, in the case of P reduction, the authors attributed to increased adsorption of P in Fe and Al oxides as chiseling was performed for 12 years, causing soil disturbance. The results of these interactions show the importance of using a diversified cropping system in the off-season (e.g.…”

Long‐term effect of conservation agriculture on the composition and nutritional value of durum wheat grains grown over 2 years in a Mediterranean environment

“…Compared to CT, mineral element accumulation 56 and root density 57 were better under CA. Besides, the higher soil moisture in conservation agriculture increases the solubility and penetration of mineral elements into a plant, 58 , which may explain the increase of P, K and Na in durum wheat under CA than CT in our experiment (Table 2). It is well known that mineral element 59 and TPC 60 are influenced by the environment, cultivar and agronomic management interactions.…”

Ferritin and Free Radicals Species in Seeds by Electron Paramagnetic Resonance

“…This free radical signal has been attributed to semiquinones radicals (Saab and Martin-Neto, 2008;Sajfutdinov et al, 2001), lignin, phenols, oxidation of fatty acids detectable in some vegetables (Yarbasi et al, 2011) as interactions with peroxides. The semiquinone free radicals are directly associated with the humification of some substances as well as with soil-organic minerals (Moreira et al, 2019;Saab and Martin-Neto, 2008).…”