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首页> 外文期刊>International Journal of Plant & Soil Science >Spatial Variability of Soil Organic Carbon and Available Nutrients under Different Topography and Land Uses in Meghalaya, India
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Spatial Variability of Soil Organic Carbon and Available Nutrients under Different Topography and Land Uses in Meghalaya, India

机译:印度梅加拉亚邦不同地形和土地利用下土壤有机碳和速效养分的空间变异性

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Nutrient loss from the soil is influenced by topography and crop uptake. Knowledge of spatial variability of soil properties can help in site-specific nutrient management. It was attempted to study the effect of topography and land uses on spatial variability of soil organic carbon (SOC), available nitrogen (N), available phosphorus (P) and available potassium (K) in acidic soils of the research farm of National Bureau of Plant Genetic Resource having annual crop (ginger/turmeric) with 25% slope (NBPGR 1), buckwheat-pulse, maize-fallow, perennial medicinal plants with 9% slope (NBPGR 2), Indian Council of Agricultural Research-Krishi Vigyan Kendra farm having ginger/turmeric, maize-vegetable, pulse-vegetable with 9% slope (ICAR-KVK) and ICAR-Horticulture farm having guava/mandarin with 25% slope. The SOC content was in the order of guava (2.15%) > mandarin (2.06%) > ginger/turmeric at NBPGR 1(1.98%) > maize-vegetable (1.87%) > medicinal plants (1.81%) > buckwheat-pulse (1.78%) > maize-fallow (1.76%) = pulses-vegetable (1.76%) > ginger/turmeric at ICAR-KVK (1.56%). The N was higher in buckwheat-pulse (460.35 kg/ha) followed by guava (420.85 kg/ha), maize-fallow (409.92 kg/ha), ginger/turmeric of ICAR-KVK (404.50 kg/ha), medicinal plants (402.2 kg/ha), pulse-vegetable (377.46 kg/ha), mandarin (366.14 kg/ha), maize-vegetable (364.68 kg/ha) and ginger/turmeric of NBPGR 1 (348.06 kg/ha). The P was in the order of maize-vegetable (52.07 kg/ha) > pulse-vegetable (40.14 kg/ha1) > ginger/turmeric of ICAR-KVK (35.67 kg/ha) > buckwheat-pulses (22.23 kg/ha) > mandarin (21.06 kg/ha) > guava (20.83 kg/ha) > maize-fallow (16.58 kg/ha) > ginger/turmeric of NBPGR 1 (15.71 kg/ha) > medicinal plants (13.33 kg/ha). The K was observed higher in guava (422.80 kg/ha) followed by buckwheat-pulse (330.86 kg/ha), ginger/turmeric of NBPGR 1 (192.13 kg/ha) and maize-vegetable (181.73 kg/ha). The nugget/sill ratio of P had strong to moderate and SOC, N and K had moderate to weak spatial autocorrelation in NBPGR 1 and NBPGR 2. All the nutrients in ICAR-KVK farm were found to have weak spatial correlation. Most suitable interpolation technique for SOC and K was the Radial Basis Function (RBF), ordinary kriging for N and P and gaussian model for ICAR-KVK farm. In ICAR-Horticulture farm, the exponential and pentaspherical semivariogram model best described the SOC, N, K and P, respectively. The nugget/sill ratio of P and K showed moderate spatial dependence and this was weak for SOC and N.
机译:土壤养分流失受地形和作物吸收的影响。了解土壤特性的空间变异性有助于特定地点的养分管理。试图研究国家局研究农场的酸性土壤中地形和土地利用对土壤有机碳(SOC),有效氮(N),有效磷(P)和有效钾(K)的空间变异性的影响年遗传(姜/姜黄)坡度为25%(NBPGR 1),荞麦脉冲,玉米小叶,坡度为9%的多年生药用植物(NBPGR 2)的植物遗传资源研究,印度农业研究理事会-Krishi Vigyan Kendra姜/姜黄,玉米蔬菜,豆类蔬菜坡度为9%的农场(ICAR-KVK),番石榴/普通话坡度为25%的ICAR园艺农场。 SOC含量依次为番石榴(2.15%)>普通话(2.06%)>生姜/姜黄(NBPGR 1(1.98%)>玉米-蔬菜(1.87%)>药用植物(1.81%)>荞麦脉冲(在ICAR-KVK(1.76%)>玉米休闲(1.76%)=豆类蔬菜(1.76%)>生姜/姜黄。荞麦脉冲(460.35 kg / ha)中的氮含量较高,其次是番石榴(420.85 kg / ha),玉米小叶(409.92 kg / ha),ICAR-KVK的生姜/姜黄(404.50 kg / ha),药用植物(402.2公斤/公顷),豆类蔬菜(377.46公斤/公顷),国语(366.14公斤/公顷),玉米-蔬菜(364.68公斤/公顷)和NBPGR 1的生姜/姜黄(348.06公斤/公顷)。 P依次为玉米蔬菜(52.07 kg / ha)>脉冲蔬菜(40.14 kg / ha1)> ICAR-KVK的生姜/姜黄(35.67 kg / ha)>荞麦脉冲(22.23 kg / ha) >普通话(21.06千克/公顷)>番石榴(20.83千克/公顷)>玉米小叶(16.58千克/公顷)> NBPGR 1的姜/姜黄(15.71千克/公顷)>药用植物(13.33千克/公顷)。观察到番石榴中的钾含量较高(422.80 kg / ha),其次是荞麦脉冲(330.86 kg / ha),生姜/姜黄NBPGR 1(192.13 kg / ha)和玉米-蔬菜(181.73 kg / ha)。在NBPGR 1和NBPGR 2中,磷的块/基比具有强至中度,而SOC,N和K具有中至弱的空间自相关。ICAR-KVK农场的所有营养成分均具有弱的空间相关性。 SOC和K最适合的插值技术是径向基函数(RBF),N和P的普通克里金法以及ICAR-KVK农场的高斯模型。在ICAR园艺场中,指数半球方差模型和五球形半变异函数模型分别最佳地描述了SOC,N,K和P。 P和K的块金/基石比显示出适度的空间依赖性,而对于SOC和N则很弱。

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