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To study the effect of brackish water on carbon, nitrogen and phosphorus in the soil nearby root zone of crops. By analyzing the influence of different levels of salt and fresh water combination irrigation on organic carbon, nitrogen and phosphorus migration rule in the soil, and the dynamic change rule in different sections to investigate the spat...
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... is taken from the shallow groundwater in the test area. The salt content is 1.7g/L, and the water is evaporated under the sunshine. Then, according to the test requirements, irrigation waters with different amount of salt are prepared. The drip irrigation method simulates a Marange flask for irrigation ( Khajanchi and Minhas, 2015), as shown in Fig. 1. The flow rate is controlled at 2L/h, taking into account the high evaporation intensity during the day, the irrigation time is set at night. According to the soil properties and root distribution of the jujube tree root area, brackish water drip irrigation quota, irrigation water salinity and fertilization measures of root zone ( ...
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... The development of sugarcane plantations demands concept application of precise agriculture (precise farming), namely precision of location (Martins et al., 2018; Baranowska et al., 2019), dose, time, data and information as well as technology (Carvalho et al., 2018;Wildayana et al., 2016). Such precise agriculture will lead to the management system based on technology and needed information, which is capable of identifying, analyzing, and site-specific managing of temporal and spatial soil variability, thus the optimal sugarcane productivity can be achieved, which is beneficial, sustainable (Wildayana and Armanto, 2018; Rybak et al., 2019; Kaleta et al., 2019) and does not pollute the environment due to input and agricultural machinery (Li, 2018;Guzeeva, 2019). This concept will be able to identify the level of soil suitability to sugarcane, status of soil fertility, and other soil and water quality parameters (rooting condition, soil acidity, oxygen and water availability, retention and buffering capability as well as topography). ...
Uniforming sugarcane management without any knowledge of soil variability could result in some parts of a sugarcane field receiving insufficient inputs, while other parts receive an excess input. The research aimed to assess soil variability and sugarcane biomass along Ultisol toposequences in Central Lampung, Indonesia. Two sugarcane catenas and one forest catena were fully described in the fields. Soil horizons are represented by Ap/Ah/M, E, B, Cc and Cg with dominant clay translocation. Gleying symptom was found only in the lower slope to depression. Concretion depths can be used as an erosion indicator if the soil parent material is well characterized. Soil P has a maximum value of Ap horizon and decreases with depth and no effect of internal erosion in the form of soil P accumulation in subsoils, except for the colluviated horizon. Kaolinite clay is dominantly found to buffer changes in pH, except Ap horizon of sugarcane. The organic C depends on the pedogenesis and catena form. Al saturation indicates the dominant soil weathering intensive. Al saturation in the Ap horizon (Catena G1; G2) was reduced from 80 % to 20-40 % caused by liming and fertilization. Catena position was the main factors causing the increasing soil variability, which was responsible for the variability of sugarcane biomass. The sugarcane biomass increased with decreasing the slopes. The highest biomass was found in the depression (105 tones/ha) if the sedimentation process is characterized by the formation horizon M and accompanied by the nutrient accumulation from the hilltops.
