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61.
de Oliveira José Francirlei Mayi Stanislas Marchão Robélio Leandro Corazza Edemar Joaquim Hurtado Sandro Carmelino Malaquias Juaci Vitória Tavares Filho João Brossard Michel Guimarães Maria de Fátima 《Precision Agriculture》2019,20(6):1251-1273
Precision Agriculture - The uniform management of soil, without considering the local soil spatial variability of its properties, may accelerate its degradation process. The objectives of this... 相似文献
62.
Melissa López‐Vela María Esther Puente Roberto Civera‐Cerecedo Bertha Olivia Arredondo‐Vega Edemar Roberto Andreatta Francisco J Magallón‐Barajas 《Aquaculture Research》2014,45(12):1921-1931
Phosphorous (P) and nitrogen (N) residuals from Litopenaeus vannamei and N and P retention by L. vannamei were studied at three protein levels and with two protein sources: fish meal with plant protein (AVD) and plant protein with squid meal as an attractant (VD). A protein retention bioassay began with shrimp that were 1.5–2.5 g, and nutrient release bioassays were conducted with shrimp of two sizes (4.5 and 8.5 g). Both bioassays were conducted at: 30 ± 0.5°C, [O2] > 4 mg L?1, and 38 UPS. Total P residuals were significantly higher for AVDs than for VDs (P < 0.05), particularly those with a high dietary protein level. The particulate P fraction was the predominant form of P. Total N and inorganic dissolved N, mainly in ammonia form, significantly increased (P < 0.05) with dietary protein level and shrimp size, regardless of the protein source. VDs resulted in significantly greater P retention (P < 0.05) than AVDs, without significantly affecting growth rates or survival. P retention as well as N retention decreased with increasing protein supplementation level, independently of the protein source used (P > 0.05). This study shows that the substitution of fish meal with plant protein (soybean meal and wheat flour) improves P retention in L. vannamei. 相似文献