Excessive Fertilizer Usage Drives Agriculture Growth but Depletes Water Quality

Kondraju, Tarun Teja; Rajan, K. S.

doi:10.5194/isprs-annals-iv-3-w1-17-2019

Cited by 11 publications

(4 citation statements)

References 23 publications

(23 reference statements)

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“…Studies have shown that growing soybean production over time is accompanied by, in part, an increasing use of fertilizers (Tilman et al, 2001;FAO, 2018). In this sense, FAO (2019) estimates an average annual increase of 1.3% in world synthetic fertilizer demand for nitrogen (N), P, and K, and studies have shown that increases in fertilizer use can result in increased amounts of nutrients and toxins levels in ground and surface waters, incurring health and water purification costs and decreasing fishery and recreational values (Tilman et al, 2002;Kondraju and Rajan, 2019).…”

Section: Introductionmentioning

confidence: 99%

Normalized Difference Vegetation Index (NDVI) for soybean biomass and nutrient uptake estimation in response to production systems and fertilization strategies

Farias

Bremm

Bredemeier

et al. 2023

Front. Sustain. Food Syst.

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The system fertilization approach emerged to improve nutrient use efficiency in croplands. This new fertilization concept aims at taking advantage of nutrient cycling within an agroecosystem to obtain maximum production from each nutrient unit. To monitor this effect, methodologies such as the Normalized Difference Vegetation Index (NDVI) are promising to evaluate plant biomass and nutrient content. We evaluated the use of NDVI as a predictor of shoot biomass, P and K uptake, and yield in soybean. Treatments consisted of two production systems [integrated crop-livestock system (ICLS) and cropping system (CS)] and two periods of phosphorus (P) and potassium (K) fertilization (crop fertilization—P and K applied at soybean sowing—and system fertilization—P and K applied in the pasture establishment). NDVI was evaluated weekly from the growth stage V2 up to growth stage R8, using the Greenseeker® canopy sensor. At the growth stages V4, V6, R2, and R4, plants were sampled after NDVI evaluation for chemical analysis. Soybean yield and K uptake were similar between production systems and fertilization strategies (P > 0.05). Soybean shoot biomass and P uptake were, respectively, 25.3% and 29.7% higher in ICLS compared to CS (P < 0.05). For NDVI, an interaction between the production system and days after sowing (P < 0.05) was observed. NDVI increased to 0.95 at 96 days after sowing in CS and to 0.92 at 92 days after sowing in ICLS. A significant relationship between NDVI and shoot biomass, and P and K uptake was observed (P < 0.05). Our results show that the vegetation index NDVI can be used for estimating shoot biomass and P and K uptake in the early growth stages of soybean crops, providing farmers with a new tool for evaluating the spatial variability of soybean growth and nutrition.

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Section: Introductionmentioning

confidence: 99%

Normalized Difference Vegetation Index (NDVI) for soybean biomass and nutrient uptake estimation in response to production systems and fertilization strategies

Farias

Bremm

Bredemeier

et al. 2023

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

show abstract

“…This filtration is due to the low assimilation of fertilizers by plants, which only captures a small part of the fertilizers incorporated in the soil. In addition, this low assimilation generates that more quantity of fertilizers must be incorporated into the soil during the crop growth, which results in a higher production cost [7].…”

Section: Introductionmentioning

confidence: 99%

Controlled Release of Zinc from Soy Protein-Based Matrices to Plants

et al. 2021

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Controlled release systems are increasing their presence on the market. However, their use is not generating a great impact on horticultural production, mainly due to their price, which makes crop production more expensive. This work proposes a cheaper alternative for the manufacture of these devices. Thus, an agri-food byproduct (soy protein isolate) and a thermomechanical processing were used to create devices (matrices) that can compete in price with the use of conventional fertilizers (0.50–2.00 €/kg). First, different processing methods were evaluated to obtain the matrix with the most optimal mechanical, functional (zinc and water retention/release, biodegradability) and morphological (zinc distribution) properties for the supply of zinc (micronutrient). This was achieved by incorporating an ethanol immersion step into the processing to remove the plasticizer before its use in horticulture. Finally, the efficiency of these matrices was verified in crops (lettuce and peppers), improving up to 60% the assimilation of zinc by plants that conventional fertilization achieves. In addition, these matrices allow a 33% reduction in the water used during cultivation. This work has opened a new possibility of creating more efficient devices for the incorporation of fertilizers into crops, also having an affordable price for industrial use.

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“…The conventional use of fertilizers usually leads to an excess of nutrients, due to their low assimilation by the plants. This fact makes this method ineffective, since a large quantity of fertilizer is necessary to perceive an improvement in the soil (Kondraju and Rajan, 2019). For this reason, it is necessary to find an alternative that helps introducing nutrients into plants and improves the assimilation efficiency of the conventional method.…”

Section: Introductionmentioning

confidence: 99%