Late-season nitrogen applications improve grain yield and fertilizer-use efficiency of dry direct-seeded rice in the tropics

ABSTRACT Little is known about the management of high-yield clonal Coffea canephora in the Amazonian Region, mainly for nutritional aspects and cultivation system efficiency. This study aimed to evaluate the influence of different nitrogen and potassium fertilization rates on coffee grain yield and fertilizer use efficiency of C. canephora trees. An experiment was performed at an experimental field of the Embrapa Rondônia in Porto Velho (RO), Brazil. It was carried out in a split-plot scheme with six doses of 20-00-20 NPK formulation (0; 250; 500; 1,000; 2,000; and 3,000 kg ha-1) and three years of evaluation (2014, 2015, and 2016). An interaction between fertilizer dose and crop year was observed. Fertilizer doses showed an exponential behavior, with maximum yields of 51, 114, and 79 bags ha-1 at 3,000 kg ha-1 in the crop years of 2014, 2015, and 2016, respectively. Such a behavior impacted average and accumulated yields in the three harvest seasons. As for crop year effect within each fertilizer dose, the highest yield was reached in the second harvest after pruning for renewal of orthotropic stems. Moreover, fertilizer use efficiency by plants decreased exponentially, with the highest value at the lowest dose. Increasing doses of 20-00-20 formulation promoted an exponential increase in grain yield but decreased its use efficiency by C. canephora plants. This management also stimulated a strong biannual production.

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Effects of Sandy Soil Amendment on Soil Moisture and Growth Status of Millet with Rainfed Sandy Soil in a Semi-Arid Region

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1092-1093.1234 ◽

2015 ◽

Vol 1092-1093 ◽

pp. 1234-1242 ◽

Cited By ~ 1

Author(s):

Jun Zhen Mi ◽

Jing Hui Liu ◽

Sheng Tao Xu ◽

Bao Ping Zhao ◽

Man Hong Yang ◽

...

Keyword(s):

Soil Moisture ◽

Grain Yield ◽

Sandy Soil ◽

Arid Region ◽

Soil Amendment ◽

Fertilizer Use Efficiency ◽

Fertilizer Use ◽

Use Efficiency ◽

Semi Arid Region ◽

Semi Arid

Effect of different amount sandy soil amendment on soil moisture and millet growth was studied in a rainfed field experiment in a semi-arid region in northern China in 2011-2013. Three-year results show: sandy soil amendment treatments all increased soil moisture, they are T3>T4>T5>T2>T1>CK, and with depth of soil layer increasing, differences of among treatments reduced; it can significantly (P<0.05) increased plant height of millet and dry matter accumulation above-ground by 1.77%-25.67% and 3.21%-104.79% respectively compared with CK; grain yield under sandy soil amendment is significantly (P<0.05) higher than CK, yield of 18000 kg·hm-2 and 24000 kg·hm-2 treatments is higher than others,being 5102.55 kg·hm-2 and 5035.85 kg·hm-2, biological yield, water and fertilizer use efficiency have the same effect as grain yield. Above all, using sandy soil amendment can improve the condition of soil moisture and fertilizer, sufficiently use limited rainfall, increase crop yield, increases water and fertilizer use efficiency, treatments with 18000 kg·hm-2,24000 kg·hm-2 sandy soil amendment show a better effect on resisting drought, retaining fertilizer and increasing yield under millet production in all the treatments.

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