scholarly journals Development, yield and quality attributes of sugarcane cultivars fertigated by subsurface drip irrigation

2016 ◽  
Vol 20 (6) ◽  
pp. 525-532 ◽  
Author(s):  
André L. B. de O. Silva ◽  
Regina C. M. Pires ◽  
Rafael V. Ribeiro ◽  
Eduardo C. Machado ◽  
Gabriel C. Blain ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Drip Irrigation ◽  
Field Capacity ◽  
Soluble Solids ◽  
Subsurface Drip Irrigation ◽  
Yield And Quality ◽  
Crop Development ◽  
Crop Cycle ◽  
Subsurface Drip ◽  
Solids Content

ABSTRACT The present study aimed to evaluate the development, yield and quality of four sugarcane cultivars fertigated by subsurface drip system. The experiment was carried out in Campinas-SP, Brazil, from January 2012 to November 2013, with the cultivars SP79-1011, IACSP94-2101, IACSP94-2094 and IACSP95-5000 subjected to daily irrigations. The irrigations depths were applied to bring soil moisture to field capacity. Soil moisture was monitored using soil moisture probes. Samples were collected along the crop cycle in order to evaluate crop development and yield, at the end of the first and second ratoons. Stalk height showed good correlation for the estimation of crop yield, with R2 equal to or higher than 0.96. The cultivar IACSP95-5000 showed the highest yield in the first ratoon. In the second ratoon the highest yield was observed in IACSP94-2101, followed by IACSP95-5000 and SP79-1011. Considering the yield results associated with the technological analysis, such as soluble solids content and apparent sucrose, the cultivar IACSP95-5000 excelled the others in the cultivation under subsurface drip irrigation.

scholarly journals Mechanisms of Subsurface Drip Irrigation-Mediated Suppression of Lettuce Drop Caused by Sclerotinia minor

1998 ◽  
Vol 88 (3) ◽  
pp. 252-259 ◽  
Author(s):  
A. A. Bell ◽  
L. Liu ◽  
B. Reidy ◽  
R. M. Davis ◽  
K. V. Subbarao
Keyword(s):  
Soil Moisture ◽  
Drip Irrigation ◽  
Soil Microflora ◽  
Sampling Time ◽  
Furrow Irrigation ◽  
Subsurface Drip Irrigation ◽  
Microbial Populations ◽  
Irrigation Methods ◽  
Lettuce Drop ◽  
Subsurface Drip

Subsurface drip irrigation and associated mandatory minimum tillage practices significantly reduced the incidence of lettuce drop (Sclerotinia minor) and the severity of corky root on lettuce compared with furrow irrigation and conventional tillage. Three possible mechanisms for the drip irrigation-mediated disease suppression were examined in this study: qualitative and quantitative differences in the soil microflora under furrow and subsurface drip irrigation; their antagonism and potential bio-control effects on S. minor; and the physical distribution of soil moisture and temperature relative to the two irrigation methods. To determine if the suppressive effects under subsurface drip irrigation were related to changes in soil microflora, soils were assayed for actinomycetes, bacteria, and fungi during the spring and fall seasons. The effects of the irrigation methods on microbial populations were nearly identical during both seasons. In the spring season, the total number of fungal colonies recovered on potato dextrose agar amended with rose Bengal generally was greater in soils under drip irrigation than under furrow irrigation, but no such differences were observed during the fall. Numbers of actinomycetes and bacteria were not significantly different between irrigation methods during either season. No interaction between sampling time and irrigation methods was observed for any of the microbial populations during both seasons. Thus, the significant effect of sampling time observed for actinomycete and bacterial populations during the spring was most likely not caused by the irrigation treatments. There were also no qualitative differences in the three groups of soil microflora between the irrigation treatments. Even though some fungal, actinomycete, and bacterial isolates suppressed mycelial growth of S. minor in in vitro assays, the isolates came from both subsurface drip- and furrow-irrigated soils. In in planta assays, selected isolates failed to reduce the incidence of drop in lettuce plants. The soil moisture under subsurface drip irrigation was significantly lower at all depths and distances from the bed center after an irrigation event than under furrow irrigation. The soil temperature, in contrast, was significantly higher at both 5 and 15 cm depths under drip irrigation than under furrow irrigation. The suppression of lettuce drop under subsurface drip irrigation compared with furrow irrigation is attributed to differential moisture and temperature effects rather than to changes in the soil microflora or their inhibitory effects on S. minor.

scholarly journals Agro-industry production of sugarcane grown using subsurface drip fertigation with nitrogen and potassium

2018 ◽  
Vol 53 (12) ◽  
pp. 1346-1354
Author(s):  
Fábio Nunes do Nascimento ◽  
Aderson Soares de Andrade Júnior ◽  
Edson Alves Bastos ◽  
Valdenir Queiroz Ribeiro ◽  
Alzeneide da Silva Lopes
Keyword(s):  
Block Design ◽  
Saccharum Officinarum ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Crop Cycle ◽  
Technological Quality ◽  
Stalk Yield ◽  
Subsurface Drip ◽  
Solids Content ◽  
Drip Fertigation

Abstract: The objective of this work was to evaluate the stalk yield, technological quality parameters, and sugar and alcohol productions in the first sugarcane (Saccharum officinarum) crop cycle, according to the response to N and K2O applications by subsurface drip fertigation. The experiment was carried out in a dystrophic Ultisol, in a randomized complete block design with four replicates. The treatments consisted of a 2X + 2X + 1 incomplete factorial arrangement with the application of 60, 80, 120, 160, and 180 kg ha-1 N and 60, 80, 120, 160, and 180 kg ha-1 K2O. The maximum estimated yield (217.5 Mg ha-1) was obtained with the application of 180 kg ha-1 N and 60 kg ha-1 K2O. Sugar and alcohol productions increased with N application above 120 kg ha-1. The technological quality characteristics of soluble solids content, apparent sucrose in the juice/broth, apparent sucrose in sugarcane, purity, and fiber show the highest averages with the application of 180 kg ha-1 N and 60 kg ha-1 K2O.

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