Diagnosis of the Nutritional Status of Garlic Crops

Abstract

Univariate methods for diagnosing nutritional status such as the sufficiency range and the critical level for garlic crops are very susceptible to the effects of dilution and accumulation of nutrients. Therefore, this study aimed to establish bivariate and multivariate norms for this crop using the Diagnosis and Recommendation Integrated System (DRIS) and Nutritional Composition Diagnosis (CND), respectively. The criteria used were nutritional status and the sufficiency range, and then the diagnoses were compared. The study was performed in the region of Alto Paranaíba, MG, Brazil, during the crop seasons 2012 and 2013. Samples comprised 99 commercial fields of garlic, cultivated with the cultivar "Ito" and mostly established in Latossolo Vermelho-Amarelo Distrófico (Oxisol). Copper and K were the nutrients with the highest number of fields diagnosed as limiting by lack (LF) and limiting by excess (LE), respectively. The DRIS method presented greater tendency to diagnose LF, while the CND tended towards LE. The sufficiency range of both methods presented narrow ranges in relation to those suggested by the literature. Moreover, all ranges produced by the CND method provided narrower ranges than the DRIS method. The CND method showed better performance than DRIS in distinguishing crop yield covered by different diagnoses. Turning to the criterion of evaluation, the study found that nutritional status gave a better performance than sufficiency range in terms of distinguishing diagnoses regarding yield.

Garlic (Allium sativum) feature-specific nutrient dosage based on using machine learning models

“…Maximum marketable yield of 12.9–15.8 Mg ha -1 , at 200 kg N ha -1 , was recorded under field conditions in Mid-Eastern Santa Catarina State, where soil organic matter ranges from 3.9% to 4.9%, [ 14 ]. Mean fertilizer dosage of 222±30 kg N ha -1 was recorded in garlic farms, in Minas Gerais State, Brazil [ 8 ]. Nitrogen (N) applied by growers (2018–2019) ranged from 130 to 180 kg N ha -1 in the present collaborative study, and this finding reflects growers’ caution about the potential negative effects of N over-fertilization on crop quality.…”

“…Garlic yield in Brazil reaches 11 Mg ha -1 , on average; it ranged from 4 to 18 Mg ha -1 in recent crops [ 6 ]. Temperature, rainfall and photoperiod are the variables mostly influencing bulb yield at regional scale [ 7 , 8 ]. There is great potential to increase garlic yield through genetic enhancement programs [ 5 , 9 , 10 ], optimum plant density [ 11 ], pest management [ 12 ], irrigation [ 13 ] and site-specific fertilization [ 2 , 6 , 14 ].…”

Yields gap evaluation of wheat grown in Piedmont plain and Floodplain soils of Bangladesh through compositional nutrient diagnosis (CND) norm

“…This molar ratio of different nutrients indicates apparent antagonistic and synergetic effects of a particular nutrient on other nutrient in wheat plants (Cunha et al, 2016).…”

“…Leaf analysis is a good tool to monitor, evaluate and adjust agricultural fertilization programs to reduce the yield gap (To mio et al, 2015; Cunha et al, 2016). Because, the leaf is the prime portion of plant that reflect any stresses.…”

“…Although several nutrient diagnosis approaches were identified for nutrient balance in relation to yield of conifer seedling, onion, garlic, pepper, potato and fruits (Parent et al, 1995;Cunha et al, 2016). A mong the different methods, the CND approach was identified as an effective mu ltivariate for distinguishing yield gap by considering the leaf nutritional d isorder (Cunha et al, 2016). At present it is fact that there is no information about the nutrient diagnosis approach for wheat in farmers' fields in floodplain and piedmont plain soil.…”